The customer display.

Plug a second monitor in and set Windows to Extend these displays (Windows key + P, Extend).

On the Sell screen choose Customer view: ARC OS opens it full screen on the second monitor.

Customers see the items, the total, offers and LankaQR (with the amount filled in when you saved your LankaQR code text), never costs or other customers.

Settings, Customer display sets the language, welcome messages and photos.