Show MacOS app switcher on all displays

One thing that really bothered me when using an external display on MacOS was that the App Switcher (Cmd+Tab) would only appear on the screen where the Dock was last visible.

To resolve this and display the App Switcher on all screens instead of just one, execute the following command in the Terminal:

$ defaults write com.apple.dock appswitcher-all-displays -bool true
$ killall Dock