Some venues use a combination of integrated POS printing and direct printing. There are a few reasons to do this.
Some venues don't use their POS printers, but still want sales to go into their pos. By enabling "Also print on direct printer", venues can send Mr Yum orders to print on the printers provided by Mr Yum.
Venues with pop up traders or food trucks can set up a Mr Yum printer to send orders to these vendors, without them needing a POS terminal.