Every time a Minecraft update is released, if the Full Screen video setting is set to FALSE, Full Screen setting is set back to full screen TRUE.

Each update Minecraft Windows 10 edition receives the Full Screen Video setting is reset to default full screen mode enabled. Users that do not use full screen have to go into the settings and change the setting so it’s not full screen again. I have had this problem for years now with each update the setting is reset. I play minecraft windowed but full desktop size. When the next update is released the video setting is reverted to this Full Screen setting.