I’m trying to create a dual monitor setup for gaming. i’m a linux noob, can kinda update packages on the CLI but thats about it. I have both monitors hooked up to the computer and they function as 2 separate or mirrored displays just fine no problems there. In system settings I do not have the option to extend the primary display. I opened the windows key+P menu and selected extend to the right, but it did not do anything. What do I need to do? My KDE Plasma version is 5.27.3
You might need to adapt this [SOLVED] Treat two monitors as one? / Kernel & Hardware / Arch Linux Forums for your setup.
With Nvidia GPU that is called TwinView NVIDIA - ArchWiki
You could try this too: