Folders and links
A button can open another board instead of speaking — that’s how food menus, people pages, and topic boards hang off a core board. Tapping a folder button navigates into the sub-board; the back control in the message bar returns to the previous board.
How folder buttons are marked is a per-person display choice (Setup → Display → Folder buttons look like): a corner mark, a folder tab, a bold outline, or no marking at all.

