Subnav Toggle (mobile/Tablet)

Hi,

I’ve got the following issue regarding to the navigation on mobile and tablet.

The toggle icon (+) to open the subnavigation appears on the right in the screen. But it is only visible on hover, but on tablet and mobile there is no hover, unless you press accidentally on the icon (which isnt visible at that moment).

It would be more logical if the sub nav opens when i press on the menu item parent.

Does anyone have a solution for this problem? I am using the first header of Airi.

The page I need help with: [log in to see the link]