Offers cannot be deleted, but they can be disabled.
Disabling an offer effectively hides it, so it no longer requires any attention. Additionally, deleting offers that have already been used is not recommended, as they carry existing statistics that are important for keeping historical data accurate.
You can only delete offers that are in draft state. Once the offer is active, it can't be deleted.
However, you can still prevent affiliates from sending traffic to an offer if necessary. To do so, navigate to the Offer detail (open the details of any active offer).
Then you will click on "Edit this section" so that you can deactivate the offer.
This will open the offer status and you can simply click on "Deactivate offer."
You can schedule the deactivation as well, which is the button right next to it.
Alternatively, you can click on "Deactivate offer" right from your offer list by clicking on the three dots next to the offer name.
Once the offer is deactivated, affiliates can't access it, and you won't need to pay for conversions generated after the offer's deactivation.