Change function key behaviour for VoiceOver on Mac
By default, to use a function key in a VoiceOver command, you must also press the Fn key. Depending on your Mac, you can change this default behaviour so that you don’t have to press the Fn key for VoiceOver commands.
Choose Apple menu > System Preferences, click Keyboard, then click Keyboard.
Select the “Use F1, F2, etc. keys as standard function keys” tickbox.
This option is available on only some Mac models.
Some keyboards have dedicated keys for Home, End, Page Up and Page Down. These are important VoiceOver navigation keys. If you use a keyboard that doesn’t have these keys, use the arrow keys with the Fn key for these actions.