Search is a sheet over the page you were on: the page stays sharp under the .35 scrim, and only what lies behind the sheet is frosted. B, the Back circle or a click on the dimmed page closes it, and focus is back on the poster you left.

It opens on the field's real activation (DOM focus from a click or the D-pad), never on arrival.
Field: Steam's input, 640 × 64, the only focus ring in the system. No microphone.

Before the first keystroke: your recent games and this session's searches (kept in memory only). See All shows Steam's own list for the empty query.