By default most linux distributions give you a single display assuming that you have a computer or laptop with just one physical display device. But there’s no reason you can’t take advantage of multiple sessions using your virtual terminals instead of just 1 gui with a bunch of text consoles.
To start 3 more displays (assuming your first is 0), login on one of your other consoles, usually your first gui is running on 1 or 7, so CTRL-ALT-F2 will get you to a fresh console. Now login as the user you want to run as, then start the X session.
startx –– :1
Now switch to another terminal, (CTRL-ALT-F3), login as another user or the same user, and start another one.
startx –– :2
You get the idea…
startx –– :3