How to switch on/off your computer with Windows 10/11 to greyscale mode

1. Press Windows Key + U to open the Accessibility/Ease of Access menu.

2. Click on Color filters on the left pane.

3. Toggle the Turn on color filters switch to On.

4. Select Grayscale from the list of options. (should be preselected by default)

5. Now you can switch on/off greyscale mode anywhere with Windows key+Ctrl+C shortcut.