I recently purchased the Fisherman Ind theme. When viewing with the HTML editor preview, the Nav places each item on a separate line. When viewed using a browser, the items display correctly. With that theme, there is no toolbar icon for previewing, but there is a tab titled Preview.

And your question is ???

I'm also wondering what you want, Richard.

None of the themes have a preview button or tab. You have to open them in either the browser or the HTML Editor. If, in the Editor preview you have the menu items on one line each, it is probably because you haven't set your preferences for previewing. Open Tools - Preferences - Browser testing and choose the version of IE that you have installed (probably 9 or 10), then you should see the menu displaying correctly. Note that you have to close and reopen the Editor for the changes to take effect.