Please wrap <form id="mw-watchlist-form" action="/wiki/Special:Watchlist" method="post"></form> in a div.mw-collapsible so that the form can be collapsed (and if it can remember from one page load to the next that it was collapsed that would be better) so that users can free up a portion of that real estate at the top of their screens and since using those controls is a rare occurrence in most cases. Please see WP:Village pump (technical)/Archive 126#Watchlist heading to see there is a consensus for offering condensing at the top of the watchlist. Thank you
Workaround:
https://www.mediawiki.org/wiki/Snippets/Collapsible_ChangesList_options
Version: 1.24rc
Severity: enhancement