It's called UniversalPauseButton (no link because on phone, but you can Google it). It basically makes the PAUSE/BREAK button pause any active process. Press it again to unpause.
Will likely cause issues with online games, but if you're playing offline or in single-player, like Witcher 3, Remnant, Baldurs Gate 3, etc it works wonders.
Signed, a new parent who often has to go comfort a waking baby at night.
That also appears to be Jambo.