Not sure what happens here, but I tried changing the font (I chose Segoe UI Light, it had no effect) and then wanted to change it again.
Result: impossible to click anything in the Options dialog, or to click OK. Only Cancel works. Closing / reopening Options doesn't help either.

PS: I do like how your plugin works, but I need to be able to change font and color, because otherwise it is unreadable on dark styles. Obviously, that it blocks the whole Options dialog wasn't expected. This was in VS 2017 Pro 15.4.4.
Not sure what happens here, but I tried changing the font (I chose Segoe UI Light, it had no effect) and then wanted to change it again.
Result: impossible to click anything in the Options dialog, or to click OK. Only Cancel works. Closing / reopening Options doesn't help either.
PS: I do like how your plugin works, but I need to be able to change font and color, because otherwise it is unreadable on dark styles. Obviously, that it blocks the whole Options dialog wasn't expected. This was in VS 2017 Pro 15.4.4.