Acrobat Reader not displaying correctly

I have a new Windows 11 system with a 3840x2160 display running native but with no scaling.  Adobe Acrobat Reader does not display correctly & freezes:

1) very think window borders

2) leaves "ghost" images of the main window behind when opening or moved on the screen

3) freezes constantly (e.g. when applying signatures, sometimes on opening, etc).

I ran the cleanup tool (which itself hung at the end but, I think, did thnk), then reinstalled the latest version.

No joy.  I've searched a bit but because there are so many topics it's hard to locate anything that may apply.  I'd appreciate if anyone knows of a setting that will make Acrobat behave?

Thanks

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