How to have different scaling options on different displays on Ubuntu 20.04.2?

I have an Ubuntu 20.04.2 laptop with GNOME 3.36.8 with a 1920x1080 display connected to a 3840x2160 monitor via an HDMI cable. The problem I'm having is that I would like to scale up the contents of the 4k monitor while keeping the laptop's display the same.

Here's what I have tried:

I turned on fractional scaling in the GNOME display settings and set the monitor's scale to 200% and the laptop's display's scale to 100%. This didn't work because the laptop only displayed the upper left quarter of the "screen".

I tried to follow this answer using the command:

$ xrandr --dpi 276 --fb 7680x3840 --output HDMI-1-1 --mode 3840x2160 --pos 0x0 --output eDP-1-1 --scale 2x2 --panning 3840x2160+0+0

and I got the following error message:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  31
  Current serial number in output stream:  32

I think I would like to use xrandr but I don't know why I'm getting that error message.

Here's the output of $ xrandr --current in case that helps:

Screen 0: minimum 8 x 8, current 5760 x 2160, maximum 16384 x 16384
eDP-1-1 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 345mm x 194mm
   1920x1080     60.02*+  60.01    59.97    59.96    59.93  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
HDMI-1-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     30.00*   30.00    25.00    24.00    29.97    23.98  
   2560x1440     59.95  
   1920x1080     60.00    50.00    59.94    30.00    24.00    29.97    23.98  
   1600x900      60.00  
   1280x1024     60.02  
   1280x800      59.91  
   1280x720      60.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  

Thanks!