I only have one monitor but display settings say i have two and that im using number 2,
device manager reports it as generic non-pnp monitor, i can disable it or uninstall it from device settings but i still have the ghost monitor. If i uninstall it it just comes back after i check for hardware changes or reboot.

if i disable my gpu radeon rx 580 the generic non-pnp monitor is no longer on devices and gone in display settings
my mobo is rogstrix b450f gaming
cpu Ryzen 5 2600x

windows 20H2 (OS build 19042.685)