At the bottom right side of the date and time clock, there’s a square or rectangle box bar, click on it, it will restore or minimize all desktop application windows.
I know this is simple but I’ve come across many people asking about it LOL, and do you know why they’re asking? LOL because they’re watching something they’re not suppose to then the wife or boss came over to their desk and they want to immediately minimize everything HAHAHHAH, so use it!
If you want to use the keyboard then it’s the Windows Key plus Home button to minimize active window.
If you want to use the keyborad key to minimize or restore all windows, then it’s Windows Key plus D