Thread:Project:Support desk/Removing something from a sidebar/reply (10)

Hmm, I think it is harder. I have never actually tried that myself. I guess that the collapsable items are realized with JavaScript and/or CSS. So you could get that effect by adding the right lines of CSS code to MediaWiki:Common.css and JavaScript code to MediaWiki:Common.js.

However, if the vector extension also modifies the HTML template of the Wiki (which I don't know), then adding the CSS and JS code alone won't be enough. You then need this change as well (or you adjust the code in a way that it works without changes).