hitachi ex160lc-5 aux hydraulics

Hi, I'm trying to figure out how to switch the aux hydraulics on my EX160LC-5 from 2-way to 1-way for a hammer. The machine has a factory pilot foot pedal for aux operation but no joystick controls. I know there's a dial on the gauge for work mode—grading, general, and attachment. Does anyone know the procedure? The owner's manual doesn't really explain it. I've attached a close-up of where the aux lines connect from the stick. Thanks.

From the pictures you shared where those two hoses come off the boom, it looks like the machine is already set up for 1 way auxiliary flow to run a hammer or compactor.