I have a brand new MacBook Air, last night I updated to 10.15.6.
Now, every time I type something, it gets replicated on the top, central part of my screen, above all other windows.
I can even select it, delete/copy/cut, and even write some new.
If there's nothing on it, I can double-click in that area and get a cursor to type new letters.
I've posted two screencaptures to see what I mean.