THANK YOU, Method #1 worked and fixed the search failure issue for me. Now I can search inside specific folders and actually get results and find specific docs I am looking for. Finding this answer took nearly 20 minutes of browsing the forums and web links - seems a lot of people are looking for THIS answer going as far back as 2016, but their posts still say "answer needed". I also noticed a lot of "some people just don't like change" replies in those discussions on this exact topic, but "search not working" is not a change issue, its a "failure to perform" its duty issue. I hope those looking for their answer end up on this page like I did. I wrote the methods down in case it happens again.
For me, this search issue only started after the recent update. My system is:
Windows 10, v 20H2
(OS Build 19042.867)
Reason I ended up here: I have a "Lyrics" folder full of Word docs titled "LYRICS (and the song title)". Today, April 11th, 2021, I used the search field in this folder to find specific song, but while every Word doc starts with "LYRIC" , when I type the title I am looking for, that I can clearly see in the folder, or even type just the word "Lyric" into said search field it says "No items match your search" while I am looking at dozens of docs titled "Lyrics _ _ _ _ ".
Now that I followed Method 1, above, it works fine. Thanks again.