the launcher changed? it is even using my GPU resource... what the heck is this interface? it's so fancy, and it's using my GPU. where can I go back?? at least, where can I set the GPU to use the integrated GPU ones?
That is Big Picture mode. If you don't like it, just click the icon on the main page that looks like a power button and select "Exit Big Picture"
after you login to your steam account you will get the option to close big picture mode, there is also a low performance mode in the library section of the normal steam mode settings.
Yeah you should really disable the mode then! I also tend to play with overlay off so I can totally understand your confusion haha.