One panel serves audio, subtitle and speed selection from the player's right-hand controls. Eight row Groups are declared in XML; the panel grows to the row count and scrolls past eight.
scrim1920x1080, scrim
panel822 wide on surface, height 108 + rows + 45, centred: 504 at five rows, 720 at eight
shadow[12,12], same size, flat
border3px on all four sides, panelBorder
title[48,45], w726, h1 45: Audio tracks · Subtitles · Playback speed
rowsgroup at [48,108]; 726x63, 9 apart; label [24,12] 600 wide, body 36 text
check[660,9] 45x45 check asset, primary, on the active item only
scroll8 visible rows. Past that the window follows focus; 3px border separators appear 12 above or below the rows when more items sit there
focusrow background focus; opens on the active item
emptyone disabled row: No tracks available