Menu path: Setup > Sessions > RDP > RDP Global > Mapping > Printers

In this area, you can configure printer mapping.

Enable Client Printer Mapping

☑ The locally connected thin client printer is made available for your RDP sessions, provided that it was not disabled on the server side. (default)

The printers must be set up on the Devices > Printer > CUPS > Printers page and must be enabled there for mapping in RDP sessions.

Because the thin client merely places incoming print jobs in a queue, you need to install the printer on the server.