Slider is front of dropdown menu

If you put our slider under your menu, and it is covering the dropdown list of your menu, that is happening, because the z-index of your menu isn't specified everywhere, where it should be, which is putting the slider and your menu into the same z-index, so it's up to the browser to decide, which one it puts in front, and usually it puts our slider into the front. So you should figure out which z-index is missing from your menu, and add that CSS code to your theme/template. Here is a video, which could help.

If you put this code into your theme's/template's CSS file, it could help to solve the issue:

.n2-ss-align{
      position: relative;
      z-index: 0; 
}