Change Switch Control Navigation preferences for accessibility on Mac
On your Mac, use the Navigation pane of Switch Control preferences to set options for navigating with Switch Control.
To change these preferences, choose Apple menu > System Preferences, click Accessibility, click Switch Control, then click Navigation.
When an item is highlighted during a scan, do nothing, speak the item, play a sound, or speak and play a sound.
To change the voice used, choose Apple menu > System Preferences, click Accessibility, then click Speech.
The position from which to start when you rescan an item (such as a panel, group or window).
Auto scanning after select
By default, auto scanning is paused when you select an item; you must press the Select Item switch to resume auto scanning. To have auto scanning automatically continue after you select an item, click the pop-up menu, then choose Resume.
When pointer reaches edge
The action taken when the pointer reaches a boundary while scanning user interface.
Switch Control cursor size
The thickness of the border of the Switch Control cursor when scanning user interface.
The precision with which you control the pointer when selecting an item on the screen.
Low: When you press the Select Item switch, the blue line (for Move, Move & click, and Glide) or the pointer (for Rotate) stops.
High: When you press the Select Item switch, the blue line or the pointer substantially slows down so you can select more accurately where to stop it; when you press the switch again, it stops.
The number of times, up to 10, that a panel, group or window is scanned.
Set timing options for navigation:
Gliding & rotating cursor speed: The speed, from 0 (slowest) to 100 (fastest), at which the blocks, sector and blue lines move across the screen.
Auto scanning interval in panels: The number of seconds, up to 25, it takes to step from one item to another in a panel.
Auto scanning interval in interface: The number of seconds, up to 25, it takes to step from one item to another in user interface.
Pause on first item: The number of seconds, up to 10, that auto scanning stays on the first item in a panel, group or user interface.