Apple - Change Shortcut To Change Input Source (keyboard Language)
Answer : Here are Apple's instructions for changing shortcuts found in PH21531: Choose Apple menu > System Preferences, click Keyboard, then click Shortcuts. Select the action (Input Sources in your case) in the list that you want to change. 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. Quit and restart any apps you’re using for the new keyboard shortcut to take effect.