Hide Windows Quickly With This Keyboard Shortcut
Is your Mac display cluttered with too many windows? By pressing Command and H on your keyboard, you can instantly hide all windows belonging to the front app. You can use a similar shortcut, Command, Option, H, to hide all windows except the ones belonging to the front app. Hiding windows won’t close them, so this shortcut can declutter your screen without making you lose your place in any other programs you have open.

