How can I change the resolution?

My resolution settings are way too low. I just got started with the Unreal Engine.
I use a 42 inch monitor, which is actually a TV Screen, and my resolution is 1920 by 1080, and yet, I can’t always get to all my sculpting tools because the buttons are way too large. The toolbars, content browsers, etc. I even had to hide my “Windows” Taskbar.
How do I change the resolution in the unreal engine?

By the way, how big of a monitor and how much resolution do you really need to use the unreal engine?