For accounting and fiscal purposes, you cannot delete a closed sale.
To cancel a sale, we need to create a reverse sale. It will be the negative copy of the sale to cancel.

In the Payment section of the sale, click on the 'Cancel sale' button.
Then confirm and the reverse sale will be automatically created and validated on the current day.

Products from the initial sale are returned into inventory.

Some line items of the initial sale cannot be canceled:
– credit lines,
– and product lines returned/exchanged linked to a credit already consumed.

If the reverse sale is created on a different day than the canceled sale, you can transfer it by following this guide: Transfer a sale on a past day.