If you access the Style tab, and change your theme to a new theme, then make some changes (for example: color changes), these changes are currently not showing up in the quick preview that displays on the Style tab. This is just a display issue, and your changes are saved, you just won’t see them in the preview once you click save.
To see your changes, click to another part of the app like “Build” or “Test”, then click back on “Style” once again to view your changes.
This is all fixed up! Thank you so much for your patience while our Engineers figured this one out.