Focus inside a row. Steam focuses the switch and marks the row .gpfocuswithin. The row is the only one with a control, so the row lights (white .28, a light spot in its upper third, its own arc) and the switch is lifted: its own arc and a soft glow on the knob. One focus, read at a glance from the D-pad.
Disabled rows below keep 40 % content; they can still take focus (P-C7), shown in p2_controls_system-disabled.