HELP! Using a multiview as a switcher

My org has an auditorium with 4 cameras and two computers as inputs and 3 large screens and Zoom/Teams as the outputs.
They only have a multiview 16. So I have been using it as my switcher.
Is there software that I can use on a pc that would work as a real switcher or do I need to have them get an ATEM mini?
They only have a multiview 16. So I have been using it as my switcher.
Is there software that I can use on a pc that would work as a real switcher or do I need to have them get an ATEM mini?