There have been several threads on this matter and no response from support as of yet. I'lladdmy thought on this
The submenu items work in desktop with mouse. Unable to verify for laptop (touch) or Tablet (touch)
The problem is on mobile (iphone) expanding the submenu does not work I can tap the arrows all I want and nothing happens I suspect the touch is somehow disable on mobile.
Helix Ultimate template
SPBV 5
screen video https://clipchamp.com/watch/U1vYDCGCAlV
This is a critcal iussue an dneeds to be fix.