`xmobar -x` flag doesn't work because both monitors appear under Screen 0

When I run xrandr it shows both of my monitors as different displays under Screen 0. How do I set one of them to Screen 1? (Or is there a more elegant solution?)

I ask because I'm setting up xmonad on Debian, but xmobar only appears on one of them. Digging into the settings a bit, I see I can launch it twice, and just call a different screen id. Problem with that is: both monitors have the same screen id.

This is a fresh install of Debian 11 with Gnome running on a laptop with a second monitor plugged in via HDMI

In my xmonad.hs I tried:

main = do
  xmproc0 <- spawnPipe "xmobar -x 0 ~/.config/xmobar/xmobarrc"
  xmproc1 <- spawnPipe "xmobar -x 1 ~/.config/xmobar/xmobarrc"
...
logHook = dynamicLogWithPP $ xmobarPP
  {
  ppOutput = \x -> hPutStrLn xmproc0 x
                >> hPutStrLn xmproc1 x
...

Although xmonad appears to work, xmobar itself only appears on my laptop and not the hdmi monitor though because there is NO screen 1, and I can't seem to find any setting for using an xrandr style display, instead of an X screen.

Xrandr:

$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
eDP-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1920x1080     60.01*+  60.01    59.97    59.96    59.93  
   1680x1050     59.95    59.88  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1280x800      59.99    59.97    59.81    59.91  
   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  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   640x400       59.88    59.98  
   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 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
   1920x1080     60.00*+  50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1280x1024     60.02  
   1440x900      59.90  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      70.07    60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       66.67    60.00    59.94  
   720x400       70.08

at startup I am also running this just to put the monitors in the right order

xrandr --output HDMI-1 --left-of eDP-1 --primary