I have been using Android Studio 4.2.1 on Mac for the past 2 months, and I have been NOT able to use the global search feature which is available by clicking the top-right magnifying glass icon. If I search for anything inside my project from there, I always get "Nothing Found" which makes the tool completely useless.
I have also tried to invalidate caches and restart but made no difference.
Any ideas why that's happening and how to make it work?
Maybe you changed filter in settings(icon in the popup's top right corner):
Also, make sure that "all" tab is selected in the left corner.