Prerequisite:
When composing a reply in Zendesk, there is a convenient option to collapse the composer to better view the ticket contents, and it is very easy to expand the view:

But collapsing it back is trickier and not so convenient because the button for this action is dynamically hidden:

Finding and making it appear takes time.

Feature Request:
Make the “Hide Composer” button constantly visible and a bit larger, so it is easier to accurately hit.