Brother QL-810W Ultra-Fast Label Printer with Wireless Networking - Manual (Page 142)

How to Use P-touch Transfer Manager and P-touch Library (Windows only)
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Deleting Label Printer Data
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Use the following procedure to delete all templates or other data saved on the Label Printer.
a Connect the computer and the Label Printer and turn on the Label Printer.
The Label Printer model name appears next to a printer icon in the folder view.
b Right-click the Label Printer, and then select [ Delete All ].
A confirmation message appears.
c Click [ OK ].
All templates and other data saved in the Label Printer is deleted.