1. Make a search in Project tab (switch to All).
2. Click on what you were searching for.
3. Click on (x) in the search bar to cancel search. Project will move you to a folder, containing the searched file.
4. Maximize Game View.
5. Minimize Game View.
6. Select any other file in current Project location you are in (this is when is switches for me).
7. Try to search something again and observe "In Assets" at the top.

What is expected: the search area should stay at All.

This bug was first reported on the forums: https://discussions.unity.com/t/search-assets-in-pakages/1692722/3