Change Switch Control Navigation preferences on Mac
On your Mac, use the Navigation pane of Switch Control Accessibility System 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.
Open the Switch Control pane for me
While navigating | Indicate when an item is highlighted during a scan by playing a sound, speaking the item, or both. To change the voice used, choose Apple menu > System Preferences, click Accessibility, then click Speech. |
Restart position | 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. |
Pointer precision | 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. |
Loops | The number of times, up to 10, that a panel, group, or window is scanned. |
Timing | 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. |