There is a possibility that an outdated and corrupted display adapter driver is causing the problem. You can download the display adapter driver from its manufacturer ...

Apple imposed limitations in its M1 series of Macs about how many external displays could be attached. It’s just one for most models; a Mac mini lacks an integral display, and can support two.

I have a Dell U2720Q monitor that accepts HDMI 2.0, DisplayPort 1.4 and USB-C. I use USB-C because the monitor acts as a hub for a range of peripherals (keyboard, mouse, webcam, speakers, etc.etc) and ...