when editing a template, there is an option to open the editor in full screen, however its hard for a user to know it, as that button does include a hover text.

it is implemented in https://github.com/theforeman/foreman/blob/develop/app/views/editor/_toolbar.html.erb#L26
however, I found another implementation https://github.com/theforeman/foreman/blob/develop/app/helpers/layout_helper.rb#L126 which imho should be unified.