Here is how to regain that:
First on your keyboard press and hold Ctrl, Shift, and the (`) key beside your 1 is its general location. Alos it usually shares the same ke with the (~) figure.
So thats: Ctrl+Shift+`
This brings up an in game command screen.
Press "tab" until you see taskbar_show <------OR you can just type that.
Press enter.
Good to go.
Ctrl+Shift+` to exit the command screen.
If after this you "game paused" in the middle of your screen, just press menu- then resume game. This will fix that issue.