Open Accessibility Options
Press these keys together: Option (⌥), Command (⌘) and F5. On notebook computers with a Touch Bar, you may need to press the Fn (Function) key as well.
On notebook computers with Touch ID, triple-press Touch ID. (If you press and hold the Command key while doing this, VoiceOver is turned on or off.)
To close Accessibility Options, click Done or click anywhere outside the window.
Change the shortcuts in Accessibility Options
To change the shortcuts that appear in Accessibility Options, choose Apple menu > System Preferences, then click Accessibility. Select Shortcut in the sidebar, then use the tickboxes to turn shortcuts on or off.