Monitor with strong PiP support? Preferably > 32" @ 4k

I just bought the Samsung 37-inch ViewFinity S8 (S80UD) thinking it had an easy way to switch between which source was the dominant in the PiP. It has a stupid little button BEHIND the monitor, about 4" from the bottom, which makes it extra difficult to reach.

Any suggestions for a large-format monitor that can display a laptop as the main display, but have another laptop connected and displayed as PiP in a corner, with an easy way to switch between the two?