My settings solely present one display screen decision in Ubuntu 18.04 :

xrandr -q offers one decision as you may see. For my second display screen, many resolutions can be found.

$ xrandr -q
Display 0: minimal Eight x 8, present 3840 x 1080, most 32767 x 32767
DVI-D-Zero disconnected (regular left inverted proper x axis y axis)
HDMI-Zero linked main 1920x1080+0+0 (regular left inverted proper x axis y axis) 598mm x 336mm
   1920x1080     60.00*+  59.94    50.00    60.05    60.00    50.04  
   1680x1050     59.95  
   1600x1200     60.00  
   1440x900      59.89  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1280x720      60.00    59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    72.81    59.94    59.93  
DP-Zero disconnected (regular left inverted proper x axis y axis)
DP-1 disconnected (regular left inverted proper x axis y axis)
eDP-1-1 linked 1920x1080+1920+0 (regular left inverted proper x axis y axis) 293mm x 162mm
   1920x1080     60.03*+  48.03  
DP-1-1 disconnected (regular left inverted proper x axis y axis)
DP-1-2 disconnected (regular left inverted proper x axis y axis)

I attempted the reply from this response however what I bought is:

PRIME Shows can’t be managed by nvidia-settings and should be configured by an exterior RandR succesful instrument.

Meaning I can not management the shows because of nvidia settings. So I consider I’ve to make use of a RandR succesful instrument however I don’t know how. Should of all, I had no concept it would be so tough to vary my display screen decision. How ought to I do it?