Over the past few years this must be the 3rd or 4th or 5th time I’ve had KDE just stop responding to my hot corners. Usually in Manjaro this time in Tumbleweed. It will work for weeks or months then out of the blue just stop working. It’s how I like to switch virtual desktops. Just like Linux Mint Cinnamon does. Except Cinnamon always works. Very very annoying.