Line 6 has uploaded a cheat sheet that shows the functionality of all switches and knobs on the helix in one single sheet. On the second page the functionality of the display is shown as well as all In- and Outputs available. A great overview that deserves a place on the wall of your practice room.
Regarding Line 6 the editing on the helix is so easy that you won’t need to flip through hundreds of pages in the manual. Therefore, this cheat sheet is probably the only help you’ll ever need – hopefully.