change gears by holding space (or any face button, if ur on a controller) and pressing any cardinal direction, then releasing space while still holding that direction (u can also tap space and no direction to return to the "neutral" gear). each gear changes what the action buttons (R/L bumper on a controller, and J/K (among others) on keyboard) do. the west/left gear is your friend. try pressing the left action button (left bumper or J) twice.
this system has been altered (but not removed) in the current (non-public) build, and i may replace the demo with an updated version at some point soon, but i hope this helps for now.