I agree with Edwin.
Don't hover your cursor over any column headers and no pop-up descriptions will appear & obscure your Close button.
And, if you do make any appear, move your cursor away from them and they'll disappear after a few seconds.
If the tooltip doesn't go away even after moving your mouse away just press Win key + D to show desktop and then select task manager from task bar again, this should destroy the tooltip.
My Computer
At a glance
Windows 11 Pro 23H2Intel i3 8100 @3.6Ghz1 x 16GB DDR4 @2400 MHzNvidia GeForce GT 1030 2GB SDDR4
Bluetooth: TP Link 5.0 Nano USB adapter UB500
WLAN: D-Link 150 Pico USB adapter, N standard
Web camera: Logitech C270 HD 720p @30fps
Microphone: Trust MICO, model 23790