This is a basic one folks but addressed something that was driving me NUTS.
I was using Remote Desktop Connection (RDP) and had the bottom of the screen cutoff by my actual physical desktop toolbar even when in full screen (Figure 1 below).
The fix, for me at least, was to go into the RDP settings, move the sizing from full screen to a fixed size, then move the slider back to the full screen setting (Figure 2 below)
I literally was doing all sorts of things before this to fix the issue with no success. It was the only thing that consistently addressed the issue.
Figure 1 - My desktop toolbar overlaying the RDP full screen session
Figure 2 - Adjust the display configuration