The easiest way would be to connect your Space to H9 Control and look at the presets. The parameters mapped to the expression pedal will have glowing arcs around them showing the range that they are mapped over. You can double click on these parameters to bring up a dialog that will allow you to remove them from the expression pedal mapping. H9 Control's manual has a section that talks about expression pedal mappings. If you want to replace the current mappings with new ones, please check that out. I think there's also a tutorial video for that if you look through the tutorial video playlist.