I was having the same problem when I was using the update (KB4517245), when I clicked in the search box, I had to wait for a abnormally large amount of time before the search box unfreeze and the cursor appeared,
the right click never worked for me, not even a single time when I was using the 1909 build 18363.476… However, after uninstalling that update (if you can call it that) and start using again the 1903 build 18362.476 everything is fine again.
Also, with this new update the user needs to press enter or click in the arrow to start the search, this is a new futile and extra work for no reason, before this update the search was automatic, and started
as soon as the user stopped writing.
I want to update windows to the latest version but foremost I need a working and functional Windows.