Dual monitors in Sonoma 14.1.1

Update to 14.4 

Does it hapepn after you restart your computer and have nothing else but Illustrator running?

Do you have any other Window manager installed? There are many. Or do you have ProofPoint?

Does checking "Deactivate Native Canvas" (Photoshop > Preferences > Technology Previews)

and restarting Photoshop have any bearing on the issue?

And sometimes this helps:

Go to Preferences > Performance..., uncheck "Multithreaded Compositing", and restart Photoshop.

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management
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@Lil_C 

I've branched your post from an old, solved thread in the Photoshop forum and moved it to the Illustrator forum for you.

Jane