You may have to change your resolution in the GameSettings.ini. Navigate to C: > Users > *your name* > AppData > Local > Extended_Stay > Saved > Config > WindowsNoEditor. Then open GameUserSettings.ini in notepad, find ResolutionSizeX= and ResolutionSizeY= and set their values to your monitors resolution. Finally find "FullscreenMode=0" and replace it with "FullscreenMode=2", save and launch Extended Stay and it should launch in a usable resolution.