There are many ways to use the swing/focus mechanism. The fastest way to get left-to-right focus is to loosen both knobs and holding the slider plates in each hand, simply push and pull the sliders until an approximate focus is achieved. Tighten the swing release knob and see how close you were. You can fine-tune by tightening the swing lock, and using the focus knob focus the left side. Release the swing release knob, being careful that the slider doesn't slip, and pinch the left slider against the side of the camera. Focus the right side. Re-tighten the swing release knob and check side to side focus. Repeat if necessary. If the camera is pointed up or down at a steep angle, you will need to put some drag on the center lock to keep the whole rear standard from sliding, due to gravity.
If you try to focus with the swing release, it might loosen. Refer to the next panel for alignment instructions.