How to stop the dock from switching screens?

I'm running Mac Mini M1 on a dual monitor set up and every now and then (I don't know even how it happens or why), the dock switches from one monitor to the other. It annoys me so much.

Is there a way to stick to one screen?

Update: The solution (as pointed out by u/spamguzzler) is to go to Mission Contro and untick the box for "Displays have separate Spaces" (requires logout). This does the trick! The dock stays fixed!