Apple - Change shortcut to change input source (keyboard language)

Here are Apple's instructions for changing shortcuts found in PH21531:

  1. Choose Apple menu > System Preferences, click Keyboard, then click Shortcuts.

  2. Select the action (Input Sources in your case) in the list that you want to change.

  3. Double-click the current shortcut, then press the new key combination you want to use.

You cannot use each type of key (for example, a letter key) more than once in a key combination.

  1. Quit and restart any apps you’re using for the new keyboard shortcut to take effect.