Rocker 12: "Aux hydraulic control" is the high flow switch in mine.
In the 1st pic, K and J are for regular flow, K1 and J1 are for high flow and the bottom one of the 3 small connectors is the case drain. The reference to 1 and 2 (Hydraulic control A1 and A2) is up and down on the thumbwheel on the right joystick. Up flows the fluid in one direction, down in the other. This allows you to reverse the tool direction without moving couplers/lines.
If you have the electrical jumper installed for a high flow tool, hook the hydraulic lines to K1, J1, and case drain, put #12 toggle switch to the on position, roll the thumbwheel up (or down if you have the hydraulic lines reversed) and hit the lower left button on the left joystick, then release it and the thumbwheel simultaneously for continuous high flow. Move the thumbwheel momentarily or hit the lower left button again to stop flow.