What do I need to make my Debian see my external monitor?

I am trying to make my Debian Linux (KDE Plasma desktop environment, Wayland, stable channel) see my external monitor. My /etc/apt/sources.list :

#deb cdrom:[Debian GNU/Linux 12.6.0 _Bookworm_ - Official amd64 NETINST with firmware 20240629-10:18]/ bookworm contrib main non-free-firmware

deb http://deb.debian.org/debian/  bookworm main non-free-firmware
deb-src http://deb.debian.org/debian/  bookworm main non-free-firmware

deb http://security.debian.org/debian-security  bookworm-security main non-free-firmware
deb-src http://security.debian.org/debian-security  bookworm-security main non-free-firmware

# bookworm-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports 
deb http://deb.debian.org/debian/  bookworm-updates main non-free-firmware
deb-src http://deb.debian.org/debian/  bookworm-updates main non-free-firmware

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

xrandr --query seems to only return the laptop's built-in screen:

Screen 0: minimum 16 x 16, current 1920 x 1080, maximum 32767 x 32767
XWAYLAND0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 340mm x 190mm
   1920x1080    143.88*+
   1440x1080    143.80  
   1400x1050    143.89  
   1280x1024    143.79  
   1280x960     143.86  
   1152x864     143.92  
   1024x768     143.87  
   800x600      143.83  
   640x480      143.85  
   320x240      142.05  
   1680x1050    143.88  
   1440x900     143.86  
   1280x800     143.84  
   720x480      143.85  
   640x400      143.37  
   320x200      141.40  
   1600x900     143.93  
   1368x768     143.77  
   1280x720     143.67  
   1024x576     143.91  
   864x486      143.63  
   720x400      143.88  
   640x350      143.57

I am guessing that, as a first step, I should also include the non-free in every single place non-free-firmware is included, and then try to update/upgrade? Or maybe this is not needed? **Update:** Output of ls /sys/kernel/debug/vgaswitcheroo/:

ls: cannot access '/sys/kernel/debug/vgaswitcheroo/': No such file or directory

Output of lspci -k | grep -EA3 'VGA|3D|Display':

pcilib: Error reading /sys/bus/pci/devices/0000:00:08.3/label: Operation not permitted
01:00.0 VGA compatible controller: NVIDIA Corporation AD107M [GeForce RTX 4060 Max-Q / Mobile] (rev a1)
        Subsystem: ASUSTeK Computer Inc. AD107M [GeForce RTX 4060 Max-Q / Mobile]
        Kernel modules: nouveau
01:00.1 Audio device: NVIDIA Corporation AD107 High Definition Audio Controller (rev a1)
--
36:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt [Radeon 680M] (rev 0a)
        Subsystem: ASUSTeK Computer Inc. Rembrandt [Radeon 680M]
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu