How can I choose between which 2 of the cameras I want to switch between?

Hello!

Zoom will show all available camera devices on your system.  If you'd like them to not show up in the list, you will have to remove them from the system.

You can set the preferred device, but you cannot remove the others.

Hope that helps and please make sure to mark the solution as accepted if this information is what you needed.

Thanks! Rick