Issue: Experiencing an issue to get any results in the search window of windows 10.
Cause: Update 1903
Resolution:
Turning off BingSearch and CortanaConsent solves the problem:
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Search /v BingSearchEnabled /t REG_DWORD /d 0 /f
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Search /v CortanaConsent /t REG_DWORD /d 0 /f
Reference: https://www.reddit.com/r/sysadmin/comments/ez92x0/windows_10_no_results_in_search_window/