Well, I had a free minute and I installed it in the Muse and checked it. (You had to do this and provide us with the file). But I am sure that the solution to this problem should be solved without participation with the code. Unfortunately, you are mistaken. As the title suggests, this is a concept. And as you know, concepts are very rarely workable. This concept is not working. It is necessary to rework its code. If you know css, html, js you can do it yourself or hire a specialist. What is the reason? In order to effectively show the appearance and appearance effect, the author used the opacity attribute with the values 0 and 1 in different states. With this approach, the object becomes invisible, but not hidden. Therefore, it is present on the page and overlaps everything that is under it. Menu in the open state Menu in the closed state In addition, there are no links in the source code of the menu. Therefore, it is not possible to correct the means of the Muse and without the participation of the code. The code for this menu requires considerable refinement.
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