Problem
The Help panel becomes wider depending on the browser window width, and covers more of the page that can potentially hinder the available space exposed for users to edit the page.
Conversely, the narrower help panel width also causes some minor display issues when there 7 pr more guidance tips - as filed on T255389.
Proposed solution
Set the help panel to a fixed-width of 360px instead (as per the width in the original design).