I am a subscriber who can issue tickets (Transaction #: 06G69930UK580744P).
However, because I don't know how to issue a direct ticket, I am posting in the forum.
I tried your tips, but it did not work.
Here are the details of my situation:
1. I am using Joomla! default template: Protostar.
2. Joomla! default navigation menu is placed in position 1 (navigation). I have unpublished Joomla! default menu, published and placed Mega Menu in this position.
3. When the site is viewed in a smaller screen (smart phones or tablets), Joomla! default sandwich menu (three parallel horizontal bars on gray background) appears. As it has no functions here and because it is confusing for some of my users, I have disabled it in my user css file with the following code:
And then, I have also added the following code to have Mega Menu viewable.
I will check it for you soon, you can go to at here and create ticket