How to display drop down menu (top navigation)

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I am trying to display top navigation as drop down menu just like you see in theme "seattle". I created my own theme, then I went to "Design Manager" and then I went to "Snippets". I copied the top navigation snippet in my master page but it is showing all links as it is i.e. it is not showing in drop down format. I thought may be because I didn't use snippet from "seattle" so I copied seattle's snippet in my master page but same problem :( How do I show drop down like seattle so that I can modify it according to my needs? I will modify it using Firebug but first I need to display it which I am unable to to for the past many days now. EDIT1 I have opened preview and snippet of seattle theme I am just playing with values of StaticDisplayLevels and I notice that when I press "Update" button, it does change preview in "snippet" But when I go back to preview page (the left side tab in screenshot) and refresh page then I don't see any change. So it looks like besides pressing "Update" button I also need to do something else? Screenshots given below. Screenshot1

up vote 1 down vote accepted	Did you change any attributes inside SharePoint:AspMenu ? Try setting StaticDisplayLevels="3" and MaximumDynamicDisplayLevels="1" inside your generated HTML for the master. Or, in the Design manager, in snippet's settings, you could set the same settings according to the sceenshot:

up vote 0 down vote

If your menu is still not displaying in a drop-down, make sure the AdjustForShowStartingNode = true.