How to protect the content of my app from screenshot

Same question has been asked many times on this forum, with same answer: there is no good way.

And whatever you do will not prevent someone to take a photo of the screen with another device.

So, if information is so confidential, just don't display… or display in multiple views.

Maybe this? https://developer.apple.com/documentation/appkit/nswindow/sharingtype/none