A:AnswerMulti View allows you to watch up to four things at once on your TV, including what’s on your Smartphone. Whether it's live stats for the sports you’re watching or cheat videos while you play a game, see them all simultaneously on the big screen. While multiple HDMI inputs can’t be viewed simultaneously, here’s an example of how you can use this feature: On each screen, you can play apps like TV+ or YouTube, HDMI devices, Antenna or Cable, or USB devices, as well as screen mirror, use AirPlay, cast from an app, or cast from an IoT camera.
~ Samsung Specialist
A:AnswerYes. It will upscale the picture using its video processing.
If you are using it as a monitor, you need to use settings to get it to show 1:1 so text is not blurry from overscan that seems to be the default. How to do that is not documented. I found by trial and error when I figured out that the blurry text was from overscan - LG's have a 1:1 feature that is more obvious.