Found the reason.
If the right scroll bar is fully at the top, the file format field gets misplaced.
If the right scroll bar is dropped down level with the Import Destination field, then the file format field is correct.
At the top of the Chrome browser are three bars.
Tabs…
Address
Bookmarks quick links
So one might think the web page doesn’t have full access to my screen, as it’s prevented by the top bars, and lower task bar.
Is this why?
Gota go zzzz, cheers