Single pilot - Multi pilot
Multi Pilot time is any time flown on a multi crew aircraft, as part of a multi crew operation, associated with an MCC and a type rating.
Pilot function
Does this read as P1/P2 Dual & Instructor ?
As a PPL you will log time as either P1 or Dual. With P1 being any time you fly as P1 (solo) or P1S (exam). Any time with an instructor will be logged as Dual.
P2 is used for Multi crew flying where you will be flying as a PNF.