xrandr

returns:

Screen 0: minimum 16 x 16, current 3440 x 1440, maximum 32767 x 32767
XWAYLAND0 connected primary 3440x1440+0+0 (normal left inverted right x axis y axis) 820mm x 350mm
   3440x1440     99.96*+
   1920x1440     99.92  
   1600x1200     99.89  
   1440x1080     99.79  
   1400x1050     99.91  
   1280x1024     99.83  
   1280x960      99.78  
   1152x864      99.87  
   1024x768      99.75  
   800x600       99.66  
   640x480       99.77  
   320x240       99.32  
   1920x1200     99.90  
   1680x1050     99.85  
   1440x900      99.93  
   1280x800      99.91  
   720x480       99.31  
   640x400       99.73  
   320x200       98.84  
   2560x1440     99.97  
   2048x1152     99.88  
   1920x1080     99.82  
   1600x900      99.87  
   1368x768      99.80  
   1280x720      99.72  
   1024x576      99.86  
   864x486       99.84  
   720x400       99.68  
   640x350       99.12