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EdisEdward

macrumors 6502a
Original poster
Feb 4, 2013
550
155
Eg if I’m watching YouTube in a window and try to open up any app, in most cases that app opens up full screen and pauses my video which is annoying, I tried windows apps mode and stage manager and consistently can’t open apps as a window even if I drag it to the right side of the screen.
 
Apps will open in their last known state. So if an app was full screen when it was last used, it will re-open full screen. If it was windowed when it was used, then it'll re-open windowed.

Also, are you using the YouTube app or YouTube in Safari? I use the app, and videos switch to PiP mode when I open another app full screen. If in Safari, you can try making the video full screen (so it fills the Safari window), and then open another app. It should switch to PiP mode.
 
Be aware that apps being opened for the first time will open in full screen, assuming the app has a full screen size class. This is the default behavior and cannot be changed. But once you open the app and resize it to a smaller window, the system should remember that state and use it the next time you open the app.
 
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