diff --git a/core/App.css b/core/App.css
index 5defcff5..a3fc0d5c 100644
--- a/core/App.css
+++ b/core/App.css
@@ -1756,23 +1756,28 @@ html[data-codiff-platform='darwin'] .sidebar {
   padding: 0 8px 8px 50px;
 }
 
-.codiff-source-description-footer-row {
-  align-items: stretch;
+.codiff-source-description-overview {
+  align-items: start;
   display: grid;
-  gap: 8px;
-  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
+  gap: 12px;
+  grid-template-columns: minmax(0, 1fr) minmax(340px, 380px);
+  min-width: 0;
+}
+
+.codiff-source-description-overview-main,
+.codiff-source-description-overview-aside {
+  min-width: 0;
 }
 
-.codiff-source-description-footer-main,
-.codiff-source-description-footer-aside {
+.codiff-source-description-overview-aside {
   display: flex;
   flex-direction: column;
-  min-width: 0;
+  gap: 8px;
+  padding: 8px 8px 8px 0;
 }
 
-.codiff-source-description-footer-main > *,
-.codiff-source-description-footer-aside > * {
-  flex: 1;
+.codiff-source-description-overview-aside > * {
+  min-width: 0;
 }
 
 .source-description-comment-anonymous + .codiff-source-description-footer {
@@ -1982,10 +1987,14 @@ html[data-codiff-platform='darwin'] .sidebar {
 }
 
 @media (max-width: 1024px) {
-  .codiff-source-description-footer-row {
+  .codiff-source-description-overview {
     grid-template-columns: minmax(0, 1fr);
   }
 
+  .codiff-source-description-overview-aside {
+    padding: 0 8px 8px;
+  }
+
   .pull-request-merge-controls,
   .pull-request-merge-actions {
     justify-content: flex-start;
diff --git a/core/SharedWalkthroughApp.tsx b/core/SharedWalkthroughApp.tsx
index c075084e..d2a0a018 100644
--- a/core/SharedWalkthroughApp.tsx
+++ b/core/SharedWalkthroughApp.tsx
@@ -840,20 +840,12 @@ export function ReviewSurface({
         onMergePullRequest={mergePullRequest}
       />
     ) : undefined;
-  const sourceDescriptionFooter =
-    sourceDescriptionFooterMain && sourceDescriptionFooterAside ? (
-      <div className="codiff-source-description-footer-row">
-        <div className="codiff-source-description-footer-main">{sourceDescriptionFooterMain}</div>
-        <div className="codiff-source-description-footer-aside">{sourceDescriptionFooterAside}</div>
-      </div>
-    ) : (
-      (sourceDescriptionFooterMain ?? sourceDescriptionFooterAside)
-    );
   const sourceDescription =
     source.type === 'pull-request' ? (
       <PullRequestSourceDescription
         actions={sourceDescriptionActions}
-        footer={sourceDescriptionFooter}
+        footer={sourceDescriptionFooterMain}
+        footerAside={sourceDescriptionFooterAside}
         keymap={keymap}
         onUpdateDescription={interactive?.onUpdateDescription}
         onUpdateTitle={interactive?.onUpdateTitle}
@@ -875,7 +867,8 @@ export function ReviewSurface({
         reviewProps={commonReviewProps}
         scrollTarget={blockScrollTarget}
         sourceDescriptionActions={sourceDescriptionActions}
-        sourceDescriptionFooter={sourceDescriptionFooter}
+        sourceDescriptionFooter={sourceDescriptionFooterMain}
+        sourceDescriptionFooterAside={sourceDescriptionFooterAside}
       />
     );
   };
@@ -1158,7 +1151,8 @@ export function ReviewSurface({
               scrollTarget={treeScrollTarget}
               selectedPath={visibleSelectedPath}
               sourceDescriptionActions={sourceDescriptionActions}
-              sourceDescriptionFooter={sourceDescriptionFooter}
+              sourceDescriptionFooter={sourceDescriptionFooterMain}
+              sourceDescriptionFooterAside={sourceDescriptionFooterAside}
               walkthroughNotes={emptyWalkthroughNotes}
             />
           )
diff --git a/core/app/components/ReviewCodeView.tsx b/core/app/components/ReviewCodeView.tsx
index 14c53cfb..0bc31b41 100644
--- a/core/app/components/ReviewCodeView.tsx
+++ b/core/app/components/ReviewCodeView.tsx
@@ -943,6 +943,7 @@ function SourceDescriptionBody({
 export function PullRequestSourceDescription({
   actions,
   footer,
+  footerAside,
   keymap,
   onUpdateDescription,
   onUpdateTitle,
@@ -951,6 +952,7 @@ export function PullRequestSourceDescription({
 }: {
   actions?: ReactNode;
   footer?: ReactNode;
+  footerAside?: ReactNode;
   keymap?: CodiffKeymap;
   onUpdateDescription?: (body: string) => Promise<void> | void;
   onUpdateTitle?: (title: string) => Promise<void> | void;
@@ -972,6 +974,25 @@ export function PullRequestSourceDescription({
 
   const isCollapsed = (!sourceDescriptionHasBody && !canEditDescription) || collapsed;
   const layoutKey = `source-description-panel:${source.provider ?? ''}:${source.url}:${sourceTitle}:${sourceDescription}:${source.author?.login ?? ''}:${source.author?.avatarUrl ?? ''}:${isCollapsed ? 'collapsed' : 'open'}`;
+  const sourceDescriptionContent = (
+    <SourceDescriptionBody
+      author={sourceAuthor}
+      canEdit={canEditDescription}
+      description={sourceDescription}
+      keymap={keymap}
+      layoutKey={layoutKey}
+      onLayoutReady={() => {}}
+      onUpdateDescription={onUpdateDescription}
+      onUploadDescriptionAsset={onUploadDescriptionAsset}
+    />
+  );
+  const overviewAside =
+    footer || footerAside ? (
+      <aside className="codiff-source-description-overview-aside">
+        {footer}
+        {footerAside}
+      </aside>
+    ) : null;
 
   return (
     <div className="codiff-source-description-panel">
@@ -987,17 +1008,19 @@ export function PullRequestSourceDescription({
       />
       {!isCollapsed ? (
         <div className="codiff-source-description-panel-body">
-          <SourceDescriptionBody
-            author={sourceAuthor}
-            canEdit={canEditDescription}
-            description={sourceDescription}
-            keymap={keymap}
-            layoutKey={layoutKey}
-            onLayoutReady={() => {}}
-            onUpdateDescription={onUpdateDescription}
-            onUploadDescriptionAsset={onUploadDescriptionAsset}
-          />
-          {footer ? <div className="codiff-source-description-footer">{footer}</div> : null}
+          {overviewAside ? (
+            <div className="codiff-source-description-overview">
+              <div className="codiff-source-description-overview-main">
+                {sourceDescriptionContent}
+              </div>
+              {overviewAside}
+            </div>
+          ) : (
+            <>
+              {sourceDescriptionContent}
+              {footer ? <div className="codiff-source-description-footer">{footer}</div> : null}
+            </>
+          )}
         </div>
       ) : null}
     </div>
@@ -2486,6 +2509,7 @@ export function ReviewCodeView({
   source,
   sourceDescriptionActions,
   sourceDescriptionFooter,
+  sourceDescriptionFooterAside,
   supportsReviewCommentActions,
   theme = 'system',
   viewed,
@@ -2546,6 +2570,7 @@ export function ReviewCodeView({
   source: ReviewSource;
   sourceDescriptionActions?: ReactNode;
   sourceDescriptionFooter?: ReactNode;
+  sourceDescriptionFooterAside?: ReactNode;
   supportsReviewCommentActions: boolean;
   theme?: CodiffPreferences['theme'];
   viewed: Record<string, string>;
@@ -3802,20 +3827,44 @@ export function ReviewCodeView({
         {!sourceDescriptionCollapsed &&
         (sourceDescriptionHasContent || canEditSourceDescription) ? (
           <div className="codiff-source-description-panel-body">
-            <SourceDescriptionBody
-              ariaLabel={sourceDescriptionAriaLabel}
-              author={sourceAuthor}
-              canEdit={canEditSourceDescription}
-              description={sourceDescription}
-              keymap={keymap}
-              layoutKey="code-view-header"
-              onLayoutReady={noopLayoutReady}
-              onUpdateDescription={onUpdateSourceDescription}
-              onUploadDescriptionAsset={onUploadSourceDescriptionAsset}
-            />
-            {sourceDescriptionFooter ? (
-              <div className="codiff-source-description-footer">{sourceDescriptionFooter}</div>
-            ) : null}
+            {sourceDescriptionFooter || sourceDescriptionFooterAside ? (
+              <div className="codiff-source-description-overview">
+                <div className="codiff-source-description-overview-main">
+                  <SourceDescriptionBody
+                    ariaLabel={sourceDescriptionAriaLabel}
+                    author={sourceAuthor}
+                    canEdit={canEditSourceDescription}
+                    description={sourceDescription}
+                    keymap={keymap}
+                    layoutKey="code-view-header"
+                    onLayoutReady={noopLayoutReady}
+                    onUpdateDescription={onUpdateSourceDescription}
+                    onUploadDescriptionAsset={onUploadSourceDescriptionAsset}
+                  />
+                </div>
+                <aside className="codiff-source-description-overview-aside">
+                  {sourceDescriptionFooter}
+                  {sourceDescriptionFooterAside}
+                </aside>
+              </div>
+            ) : (
+              <>
+                <SourceDescriptionBody
+                  ariaLabel={sourceDescriptionAriaLabel}
+                  author={sourceAuthor}
+                  canEdit={canEditSourceDescription}
+                  description={sourceDescription}
+                  keymap={keymap}
+                  layoutKey="code-view-header"
+                  onLayoutReady={noopLayoutReady}
+                  onUpdateDescription={onUpdateSourceDescription}
+                  onUploadDescriptionAsset={onUploadSourceDescriptionAsset}
+                />
+                {sourceDescriptionFooter ? (
+                  <div className="codiff-source-description-footer">{sourceDescriptionFooter}</div>
+                ) : null}
+              </>
+            )}
           </div>
         ) : null}
       </div>
@@ -3833,6 +3882,7 @@ export function ReviewCodeView({
       sourceDescriptionAriaLabel,
       sourceDescriptionCollapsed,
       sourceDescriptionFooter,
+      sourceDescriptionFooterAside,
       sourceDescriptionHasContent,
       sourceDescriptionLabel,
       sourceTitle,
diff --git a/core/app/components/walkthrough/NarrativeWalkthroughView.tsx b/core/app/components/walkthrough/NarrativeWalkthroughView.tsx
index aad330e5..ac072a37 100644
--- a/core/app/components/walkthrough/NarrativeWalkthroughView.tsx
+++ b/core/app/components/walkthrough/NarrativeWalkthroughView.tsx
@@ -663,21 +663,26 @@ export function NarrativeWalkthroughView({
         }
     : null;
 
+  const arc = (
+    <Arc
+      committable={committable}
+      navigation={navigation}
+      onShareWalkthrough={onShareWalkthrough}
+      shareWalkthroughDisabled={shareWalkthroughDisabled}
+      supportAvailable={supportAvailable}
+      walkthroughView={walkthroughView}
+    />
+  );
+
   return (
-    <div
-      className="wt-hybrid"
-      onPointerDownCapture={navigation.releaseStopScrollLock}
-      onTouchStartCapture={navigation.releaseStopScrollLock}
-      onWheelCapture={navigation.releaseStopScrollLock}
-    >
-      <Arc
-        committable={committable}
-        navigation={navigation}
-        onShareWalkthrough={onShareWalkthrough}
-        shareWalkthroughDisabled={shareWalkthroughDisabled}
-        supportAvailable={supportAvailable}
-        walkthroughView={walkthroughView}
-      />
+    <>
+      {arc}
+      <div
+        className="wt-hybrid"
+        onPointerDownCapture={navigation.releaseStopScrollLock}
+        onTouchStartCapture={navigation.releaseStopScrollLock}
+        onWheelCapture={navigation.releaseStopScrollLock}
+      >
 
       {navigation.mode === 'commit' ? (
         <CommitView
@@ -782,7 +787,8 @@ export function NarrativeWalkthroughView({
             <span className="wt-upnext-file">Chapter {navigation.index + 1}</span>
           </span>
         </button>
-      ) : null}
-    </div>
+        ) : null}
+      </div>
+    </>
   );
 }
diff --git a/core/app/components/walkthrough/WalkthroughDiffSurface.tsx b/core/app/components/walkthrough/WalkthroughDiffSurface.tsx
index 29a7b32f..b0513709 100644
--- a/core/app/components/walkthrough/WalkthroughDiffSurface.tsx
+++ b/core/app/components/walkthrough/WalkthroughDiffSurface.tsx
@@ -35,6 +35,7 @@ export function WalkthroughDiffSurface({
   scrollTarget,
   sourceDescriptionActions,
   sourceDescriptionFooter,
+  sourceDescriptionFooterAside,
 }: {
   allowViewedToggle?: boolean;
   blocks: ReadonlyArray<ReviewDiffBlock>;
@@ -44,6 +45,7 @@ export function WalkthroughDiffSurface({
   scrollTarget: WalkthroughBlockScrollTarget | null;
   sourceDescriptionActions?: ReviewCodeViewProps['sourceDescriptionActions'];
   sourceDescriptionFooter?: ReviewCodeViewProps['sourceDescriptionFooter'];
+  sourceDescriptionFooterAside?: ReviewCodeViewProps['sourceDescriptionFooterAside'];
 }) {
   return (
     <div className="wt-stop wt-diff-surface">
@@ -62,6 +64,9 @@ export function WalkthroughDiffSurface({
         showSourceDescription
         sourceDescriptionActions={sourceDescriptionActions ?? reviewProps.sourceDescriptionActions}
         sourceDescriptionFooter={sourceDescriptionFooter ?? reviewProps.sourceDescriptionFooter}
+        sourceDescriptionFooterAside={
+          sourceDescriptionFooterAside ?? reviewProps.sourceDescriptionFooterAside
+        }
         walkthroughNotes={emptyWalkthroughNotes}
       />
     </div>