Use Switch Control item scanning on Apple TV
Item scanning alternately highlights each item or group of items on the entire screen until you trigger your Select Item switch. If there are many items, Switch Control highlights them in groups. When you select a group, highlighting continues with the items in the group. When you select a unique item, scanning stops and the control menu appears. Item scanning is the default when you first turn on Switch Control.
You can choose from three scanning styles:
Auto scanning automatically highlights items, one after the other.
Manual scanning uses one switch to highlight an item and another to activate it.
Single-switch step scanning uses a switch to move the highlight from item to item. If you take no action after a period of time, the highlighted item activates.
You can pick a scanning style in Settings , at Accessibility > Switch Control > Scanning Style.