Use the Switches pane of Switch Control Accessibility System Preferences to add and delete switches, assign actions to switches, and set options for auto scanning.
To open this pane, choose Apple menu > System Preferences, click Accessibility, click Switch Control, then click Switches.
Switch Control requires the Select Item switch. When auto scanning is on, Switch Control automatically moves to the next item as it steps through a panel, group, or user interface.
Before you can turn off auto scanning, you must create a Move To Next Item switch; Switch Control moves it into the Required list when you turn off auto scanning.
Optional switches to use, regardless of whether auto scanning is on or off.
Add , Remove
Add or remove an optional switch.
Action pop-up menu
Change the name or action for a switch. To use a different switch for the action, click Reassign.
Switch Control automatically steps through, or scans, items in a panel, group, or user interface. This option is on by default.
If you want to turn off auto scanning, you must add a switch for moving to the next item.
Set timing options for auto scanning:
Hold before perform duration: The number of seconds that a switch must be pressed to be recognized.
Ignore switch repeats: The number of seconds during which repeated pressing of a switch is ignored.
This option is useful if you’re prone to accidentally pressing a switch multiple times.
Hold before repeat duration: The number of seconds that a switch must be pressed to be recognized a second time.