Every time I start my new photo app, it NEVER starts in full-screen. Even if its was previously closed in full-screen!

  • same for me...bug?
    – Matte.Car
    Apr 20 '15 at 23:45
  • Do other apps resume with their window state? Is it just Photos.app?
    – Sera H
    Apr 21 '15 at 9:13
  • Yes, I have the same with Firefox. And a bit different with Acrobat Pro as it doesn't start at all after a system restart (but if manually started, it starts in full-screen!)
    – doinadoi
    Apr 21 '15 at 20:09

System Preferences > General > Uncheck "Close windows when quitting an application".

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