Find the device in the store devices page and click "Edit". Please note the serial number (last 4 should do) as it will help identifying it later

if it's a label printer, choose between condensed and full labels (see document above, under related articles, for visual representation); if it's a receipt printer, you must change to "Chit".

Save Changes if it's a receipt printer you've switched to Chit, and click Edit again ; otherwise, continue to step 4.

Navigate to the bottom: Prep Station Settings. There, you can click create

You may then craft a Name, Select the printer (use serial number you noted above), and choose between inclusive and exclusive: the former tells the printer what to print, the latter what not to print. Reject Product Override lets you exclude products from a category you allowed; allowed products let you select only one item from a category that is otherwise excluded.

Save changes to prep station, link it to the printer under "Choose Prep Station" and save changes at the printer as well!