If you made a mistake when creating a drop and/or minting any items, you can either live with your mistake or create new ones. There is no way to edit or delete a Drop or item because they are permanent on the Polygon Blockchain.
There is one work around for Drops listed on OpenSea or other third party marketplaces:
If you create a second drop, you can go to OpenSea and rename your original drop to something else, and then return to your new drop and rename it with what you want it to be. This will allow you to have the corrected information on OpenSea.