Linux Mint PRIME Problem

Main Monitor: GTX 1070 Founders Edition
Second Monitor: GTX 1060 3GB

So I wanted to know how can I change or what to do to change the PRIME to my main monitor instead of the second monitor, I’m new to Linux at all, and I was wondering what I need to do.

Also apps and games start up on my second monitor instead of my main monitor.

Here’s for example opening a game, it opens automacly on the second monitor instead of the main monitor

Hi, this is rather a Linux Mint question, not Nvidia GPU question: you will probably get better answers on Linux Mint forum. Cheers!