PUBLIC MARKS with tags "multiple screen" & "display scaling"

However, I just upgraded my work laptop to a Dell XPS 15 9550 which has 4K UHD resolution. When I hooked it up to the 1920x1080 monitor, everything looked okay at first, but then i noticed a few things: Some content looked blurry. Strangely enough, the images seem to look okay, but text (ex: website text) looks pretty pixelated. I assume this is a scaling thing where the window is scaled down in resolution to fit on the secondary monitor and then perhaps back up? Some programs (ex: Photoshop) are great on my laptop screen, but when I drag it over to the monitor, it is extremely blown up and has a very small workspace. I haven't messed with the preferences, but I assume if I shrink down the UI, it will be super small on my laptop.