Been an issue for a couple years, and I've ignored it since GIMP works fine as a replacement.
Everything is perfectly visible when not maximized, but once you hit the maximize button the small bit along the bottom gets hidden. Just enough to hide the status bar and all the bottom buttons in the Layers panel. It's visible for a split second before it disappears, almost like it's there, but underneath the bottom edge of my monitor. Tried everything to do with the task bar (no task bar, hidden, small icons, positioned on the side/top, etc) without any luck. All drivers up to date, no software interference, no weird overclocked garbage, and still doesn't work when using one monitor instead of two.
System Information:
Windows 10 Home, Windows 10 Professional
(Pretty sure it didn't work on all updates the past two years or so)
Dual 1080p Monitors (HDMI) into a GTX 1080Ti
Ryzen Threadripper 1950X
Screenshots:
Resizable (Stretched over entire screen) - https://ibb.co/RY4Nd83
Maximized - https://ibb.co/Hg6vyCZ
The only thing I haven't tried, if it's even possible, is putting Photoshop into a legacy UI mode of sorts with a proper title bar.
Thanks!