Hi, I don't want to use big picture mode EVER.
I don't want it on startup (easy, select option to start in desktop mode, this works)
BUT, the second I launch a game, it full-screens into big-picture with no apparent way to leave it.

The game I am playing starts in a WINDOW, which on my PC normally means I can play the game, and see everything behinde it, and use other windows (like web browser, etc)
BUT, when using steam-link on my phone (which is connected to a monitor, this is where steam-link is displaying) when I launch the game, it full-screens on the client side, meaning I can no longer access the desktop.
This is EVEN THOUGH, if I go over to my host PC, I clearly see the game running in a NOT Full-screen window.

How do we disable big picture COMPLETLY.
Or at the very least, is there someway to alt-tab, form the client, through to the host?
on my phone, if I have a keyboard connected and try to use most function keys (alt, command, windows key) the ♥♥♥♥♥♥♥ phone east the input and doesn't send it, so even if alt tab would work while in big picture, my phone can't do it.

Why is this so convoluted, I have all the pieces, it should be a simple thing to do!