Using Folders in a Book and publishing as HTML5

If I use folders in my book to organize content and then generate the book as HTML5, there are too many levels in the sidebar TOC. I have a folder named Administration with a single file named Install and Configure. When I generate HTML5, it creates a top level folder Administration, a second level folder Install and Configure, then the hyperlink to the actual page is listed. Administration>Install and Configure>Install and Configure. Three clicks to get to a single page. If I remove the folders, then the content is generated correctly Install and Configure>Initial configuration.Two clicks to get to the page. OK, for smaller books that might be doable, but large command references which are alphabetized and contain hundreds of files, not doable.

This is FM2017.