Goto your Assassin’s Creed .ini file in your computer. Usually the path could be: C:>Users>Username>AppData>Roaming>Ubisoft>Assassin’s Creed>AOC.ini. Or This PC > Documents > Assassin’s Creed Origins > ACO.ini. Open the .ini file with notepad, and change the following settings to: Fullscreen=0 (or WindowMaximised=0)
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