Barcodes can be switched ON and OFF from Settings > Barcodes in Katana.
Barcodes are included in the Advanced, Professional, and Enterprise plans (see more about subscription plans here). If you are using the Essentials plan, you will be asked to confirm the change to the higher plan (either a monthly or annual plan with a 14-day free trial).
How to enable barcodes in Katana?
Navigate to Settings and select Barcodes from the left side menu.
Enable one or all types of barcodes.
Read more about the different types of barcodes in Katana.
Choose whether or not you want to automatically generate internal barcodes.
Read more about generating barcodes.
Note: If you switch barcodes OFF, the respective barcode fields will disappear but existing barcodes won't be deleted. New barcodes aren't generated when barcodes are switched OFF.