Edit showing what's needed for screenshot of <a href="//commons.wikimedia.org/wiki/Category:Birds" title="Category:Birds">Category:Birds</a> showing problem of long subcategory names and their content being hidden behind the Cat-a-lot menu
<a href="//commons.wikimedia.org/wiki/User:MPF" title="User:MPF">MPF</a>
CC BY-SA 4.0
<a href="//commons.wikimedia.org/wiki/File:Screenshot_of_Category_Birds_at_Wikimedia_Commons.png" title="File:Screenshot of Category Birds at Wikimedia Commons.png">File:Screenshot of Category Birds at Wikimedia Commons.png</a>