Changing resolution

So I have a 15 inch gaming laptop and it has a 1080p screen. When i run league on 1080p everything is too small like minion hp bars and etc, so i changed the resolution to 1600*900 and now everything looks good in terms of size. However, every time i close the game all my windows like my browser gets resized as well and i get a notification that the optimal resolution to my display is 1080p. Is there a way to play on 900p without having those issues?
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