We support two modes of netting: end-of-day and intraday. This will control if your positions will be netted directly (intraday) or end-of-day. This can't changed by creating a request to PATCH /port/v1/clients/me setting the field NewPositionNettingMode to either EndOfDay or Intraday.
More Resources
Saxo General Help Centre - What is position netting?