Width documentation is broken

(Bug, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284of not found, )
Summary: https://www.querki.net/help/#!How-to-Control-the-Width-of-something-in-my-Text
This page claims to explain how to make columns. But the proposed method doesn't work, not even in the example given!