As Marie stated in this post:
I confirm that the issue still exists.
As she said: "I have tried all of the standard navigations and headers available for the landing page, but none of them work on a mobile screen. None of them show the menu and some of them just show as a blank white band. "
Me too I experienced the issue.
And I regret to disagree with the following statement:
⚡JFarrow⌁ October 19, 2018 at 10:57am
"The mobile navigation on N3 should be functional right out of the box. When you add other code, however, it can conflict if not configured properly..."
I'm sorry to disagree. No single line of code added!
The function "right out of the box" does not display any menu.
See this example:
Any help will be appreciated