ScottHope:
You can find your screen resolution here
Scott, I don't know if you have checked this or not, but.
My Recommended is 1920x1080
I run @ 1600x900
In game is set to 1368x768 fullscreen
This says my resolution is 1280x720
Tho I think the ratios are all the same or pretty close, it reports incorrectly. I didn't change anything to test if it changes, but the number it reports in not correct.
All of this is on a 22 inch wide screen monitor, and in all cases the screen is full, no bars anywhere. All except WGT and using fullscreen within browsers have taskbar across the bottom. Any games I run on this computer and Steam fill the entire screen, as I have fullscreen selected in them. Maybe curious what my Win10 machines reports as I do run it at 1920x1080.