Strange borders after upgrading to Mac OS Catalina

Since I updated to Catalina I have grey borders surrounding my text space.

I already tried everything under appearence -> main editor. I tried fixed with and no fixed with. The borders always remains. Before the upgrade to Cataline, that is under Mojave, it worked perfectly fine.

Screenshot:
imgur.com/4HL7Usw

Have you updated, either through the Scrivener UI or download, to the Catalina compatibility update––Scrivener 3.1.4?
literatureandlatte.com/scri … s?os=macOS

Amazing. This update solved my problem. Thank you so much!