Are you on a Windows system? With Windows, it's most likely to be the interface scaling on your desktop being set to something other than 100%. If you right-click on the desktop, select Display Settings, and scroll down to where it says "Change the size of text, apps, and other items", and it says something other than 100%, switch it to 100%. If it's higher, the effective size of your desktop is much smaller than the actual resolution of your screen, and the game won't fit properly.
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