Direction High/Low knobs and fields: Independently set the central pan position for the recorded stereo signal in the upper or lower frequency range (set with Crossover).
Spread High/Low sliders and fields: Independently set the stereo spread in LR signals or set the side signal level in MS signals for the upper/lower frequency range (set with Crossover).
Download the guides:
Logic Pro User Guide: PDF
Logic Pro Effects: PDF