Windows search not working/is blank

And see KB4535996 CU Win 10 v1903 build 18362.693 and v1909 build 18363.693
and its MS original https://support.microsoft.com/en-us/help/4535996

You have to read both the v1909 & v1903 bits to see all the identified issues that the update addresses. They include
- Addresses an issue that prevents the Windows Search box from rendering fully in the space allotted for it.
- Addresses an issue that might prevent the Windows Search box from showing results.

Denis