In Settings/CMS you can set the number of levels for your page menu navigation. Preset is 3, i.e. CMSimple_XH will use headings h1–h3 for splitting up the content file into web pages. Thus an h1, h2 or h3 heading will create a new web page in the table of contents. The remaining h4, h5 and h6 headings will not. They can be used as headings within a web page.
If you set 4 levels, h4 also will be used for new web pages. If you set only 2 levels, h3 and h4 can be used as headings within a web page. However in most cases 3 levels is a good compromise.
Preset is 3 menu levels, i.e. h1–h3 will create new web pages.
For headings within a web page use h4–h6.
Starting with CMSimple_XH 1.5 the plugin Pagemanager is included in the download. Pagemanager simplifies creating, renaming, moving and deleting of web pages.
Even complete folders with subfolders can be moved or deleted with Pagemanager.
Thus it should be no problem to get rid of the contents of this standard download. Alternatively you could start with the present page structure, rename pages and overwrite the contents.