If you click 2 knobs at once, you enter XY-control mode. The 2 controllers you clicked are green, and you can choose the desired parameters to control by rotating the controller. You can also navigate the controller pages by clicking select and so on. So you can select parameters from different pages.
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From the engine control screen, if you bold-press two knobs at once, you should enter the XY-select mode. The 2 controllers you pushed will be green, indicating they are pre-selected as for XY-control. You can change the pre-selection by rotating any knob, navigating through the controller pages if needed.<br clear=all>