You can cancel/de-activate a listing by navigating to your listing and clicking "De-activate". Only inspections/appraisals/revisits can be booked once this change is made. If you want to re-activate the listing to book showings, you can just click "Re-activate".
If you have already canceled/de-activated the listing on MLS, the listing will be de-activated in the Schedulock platform within 1 hour.