how to remove a display from the list ?

[ctf0]

i want to remove the generic display item, it gets connected automatically on startup and its very annoying as the mouse gets moved to that display and i have to move it all over the place to make it visible on the main display.

[waydabber]

Is this connected by the system? If so, then it detects a display connection (even though it's not there). Sadly there is no way to persuade macOS that a physically detected display does not exist, you can use the app's soft-disconnect to get rid of it. You can use a script using the app's CLI to automatically soft-disconnect it after the app starts, but that does not help with the login window. A typical technique to hide unneeded display is to configure it as a mirror target, as that will "hide" it behind a proper display.