macOS High Sierra

Use the VoiceOver modifier

You enter VoiceOver commands by pressing the VoiceOver modifier and one or more other keys. You can set the VoiceOver modifier to be the Caps Lock key or the Control and Option keys pressed at the same time. For example, to open the VoiceOver Help menu you press the Caps Lock and H keys, or the Control, Option, and H keys.

VoiceOver commands appear in help as VO-