I am really confused because this did not work for me at all. I went to File Explorer and opened to My Documents and typed the a and then "a" and all it did was move my cursor down my files to the next file in my list of folders that started with an "a/A" but it did not show anything in the search bar at all. I have tried many of the other temporary fixes and I will sometimes be able to type into the search bar and obtain a reply but not very often and when I shut off my Dell laptop I loose the temporary fix and am not able to perform any type of search.
I believe the difference is how each of us have our Windows 10 setup and something is causing this and other thing to happen like me to loose data files also.