Best answer I found is by a guy name Bree
In:
XXXhttps://www.tenforums.com/general-support/144969-cant-perform-advanced-search-windows-1909-file-explorer.htmlXXX
(link above is sent as text appended both sides with: XXX)
Bree said 22 Nov 2019
"It's easy and quick. Just uninstall the Enablement Package (KB4517245) to turn off all 1909 features and drop back from build 18363 to 18362"
(people mentioned here 1909 as a cause for the problem)
He included a photocopy of the W10 screen showing exactly how to uninstall KB4517245.
Note: W10 may upload KB4517245 again
(I had it uninstalled for about 6 months, then had to uninstall it again)
I share the frustration expressed by many here.
It is perceived by many of us as a blunt disregard on the part of MS team.
And this is a pity! In many senses W10 reached perfection.