A foot pedal or a tap on the chart can turn the page, start auto scroll, or change the key while your hands stay on the instrument. This Settings section opens the editors for those controls.
Each pedal press runs one or more actions: the next song, a scroll, the metronome, the backing track, etc. The full list is at Pedal and touch actions.
Touch zones divide the song screen into nine regions. A single tap, a double tap, and a long press in each region can run its own actions, so the screen itself works like a pedal.