The "favourite widget" sections in https://www.zabbix.com/documentation/4.0/manual/web_interface/frontend_sections/monitoring/dashboard/widgets#favourite_graphs could be improved:

• It refers to an "Add to favourites" button, but such a text is not visible anywhere on the page - it is a tooltip for the button. An inline image of the button and textual description of it would be great. For example, "...Add to the favourites <img> (star) button."
• These sections do not mention how the entries are sorted.