How the group's pages are written and how they look.

;'''Render Engine''': Which markup the group's pages are written in, wiki markup or markdown. A heading and a link are spelt differently in the two, so changing this on a group that already holds pages will leave those pages showing their own markup rather than drawing it.

;'''Group Theme''': The theme every page in the group is drawn with. Leaving it empty means the site's own theme is used.

;'''Group Header''': The name of a page whose contents stand above every page in the group. Leave it empty for no header. The page named is an ordinary wiki page in this group, so you write it the way you write any other.

;'''Group Footer''': The same, standing below every page.

;'''Allow Page Customization''': Whether a single page may set a theme, header or footer of its own.

• '''Pages May Set Their Own''' - the three settings above are what

a page falls back to when it names none of its own, and each page's settings offer it the choice.

• '''Group Setting Only''' - every page uses the three above,

whatever it was saved with, and the controls for setting its own are not shown on the page at all.