Can't fix dock on the side of main monitor with secondary monitor

I place the dock on the left side of the main monitor. However, when connected by a side car on the left, the dock is not fixed to the main monitor and moves to the left of the secondary monitor. I have always placed the dock on the left side, and since the side car has to be mainly placed on the left side to use the mouse on the right, changing the layout is such an inconvenient option that I want to fix the dock on the left side of the main monitor as much as possible, but I can't find a solution.