Adjust Switch Control settings on Apple TV
Adjust basic Switch Control settings
In Settings 
on Apple TV, go to Accessibility > Switch Control, where you can:
Add switches and specify their function
Adjust how rapidly items are scanned
Turn off auto scanning (only if you’ve added a Move to Next Item switch)
Set scanning to pause on the first item in a group
Choose how many times to cycle through the screen before hiding Switch Control
Set whether a movement action is repeated when you hold down a switch, and how long to wait before repeating
Add another action to a switch by holding down the switch for a long duration
Choose a Press behavior and set the interval for performing a second switch action to show the control menu
Set whether and how long you need to hold a switch down before it’s accepted as a switch action
Have Switch Control ignore accidental repeated switch triggers
Turn on sound effects or have items read aloud as they’re scanned
Choose which items appear in menus and the order in which they appear
Choose what to include in the Switch Control menu
Set whether items should be grouped while item scanning
Make the selection cursor larger or a different color
Fine-tune Switch Control settings
Choose Settings from the control menu to:
Adjust scanning speed
Change the location of the control menu
Turn sound or speech accompaniment on or off
Turn off groups to scan items one at a time
Change the cursor color