Exponentcms Exponent CMS → User issues

The site uses a top menu with drop-downs. In the hierarchy I have a top level under which is a single further level. This all works fine. I have also created a lot of stand-alone pages that are linked from some of the second level pages. This also works fine, except that the breadcrumbs now only show the standalone page, not the path via which it was accessed. This I expect is how it is meant to be.

What I would like to do is to pull these standalone pages into the hierarchy as a third level, but NOT include them in the menu drop-downs. So the menu would have, say, top level "Top Page" with "Sub-page 1", "Sub-page2" etc. Sub-page2 might then have "Sub-sub-page1" etc but this should only be accessible from within the page, not from the menu.

I thought there was a configuration somewhere to limit how many levels of menu you display, but I can't find it. If I click on the theme management 'Configure' for the current theme there are no options at all, nor are there any under 'Simple Theme' which is where I started from. Can't find anything in the documentation or forums, please can you help? Screen shot shows Mnutst which I don't want to appear in the menu.

Thanks.