When did this appear for you? You must have changed a setting in System Settings > Desktop & Dock or maybe you hooked your Mac up to an external display at some point?
What are your settings? Please post a screenshot of this part of System Settings > Desktop & Dock.
Hi. Thanks so much for the reply. I honestly am not sure if anything has been changed. Mine currently look like the attached screenshot. I've done two updates to my OS. It's currently on Tahoe 26.3.1 and it's been doing this windowed thing for about two months now. I haven't connected it to an external display either. it just showed the grey title bar one day and it hasn't gone away since. The game settings are all as should be which is the fullscreen, retina etc. I've changed them to see and then changed them back and it's still there.
