GPU hierarchy

Hi there, I recently upgraded my Gaming PC to an RTX 2070S from a GTX 1060, however I can see that a lot of the programs and Windows classify my 1060 GPU as GPU 0 and my 2070S as GPU 1. I was wander if there is a way in order for me to restructure them around? Thanks!

I was playing Mirror's Edge Catalyst and whenever I alt+tab my game crashes and gives me this error: https://gyazo.com/d5c89147ee4bae6cba77f5c63c8f905f It seems to be an issue with vram but I have no idea how to go about solving it, windows also says that I need to close the programme due to...