At the left of your window is the Site pane which normally displays all the pages and subfolders in your site.
If you click on the title bar ‘Site’ you can change this to Page view.
In Page view you will see a list of all the individual items that make up your FW page and their order.
The items furthest down the list are closer to the yop of the page ie bottom-most item is top-most layer.
You can change the ‘stacking’ order of these items by dragging them up and down the list.
So to solve your previous problem you could have dragged the menu item down to the bottom of the list to display at a higher level on the page.
This is where it also helps to give all your items on the page a meaningful name in the Title box in the inspector - easier to keep track of in the list.