With the System extension, you can change the volume, lock your screen or show/hide apps, and do a bunch more commands without the need to click around.
- Eject All Disks: Eject all mounted disks.
- Empty Trash: Empty the trash.
- Hide All Apps Except Frontmost: Concentrate on the frontmost app and hide all others.
- Lock Screen: Lock the screen of your Mac.
- Log Out: Log out of your account.
- Quit All Applications: Close all running applications.
- Restart: Restart your Mac.
- Set Volume to 0/25/50/75/100%: Change the volume immediately.
- Show Desktop: Move all apps to the side and show your desktop.
- Shut Down: Quit all open apps and shut system down.
- Sleep: Put your Mac to sleep.
- Sleep Displays: Put the display of your Mac to sleep.
- Toggle Bluetooth: Turn Bluetooth on and off.
- Toggle Hidden Files: Choose whether you are able to see hidden files on your Mac.
- Toggle Mute: Turn on/off the sound of your Mac. Handy during conference calls.
- Toggle System Appearance: Switch between light/dark mode on your system.
- Turn Volume Down/Up: Fine-adjust the volume of your Mac by a few percentage.
- Unhide All Hidden Apps: Bring all our hidden and running applications back and unhide them.
Some System commands will require Finder permissions or System Events permissions to perform the actions. The dialogs (like below) will show when you run the System command for the first time.
OK will provide access, and allow you to run the commands.