@b4n commented on this pull request.
-* Double-click on a symbol-list group to expand or compact it. +* Symbol list - double-click on a symbol category to expand or compact it (or click the arrow).
```suggestion * Double-click on an item in the symbols or documents lists to expand or fold its children. ```
It's actually a treeview feature (I believe) and it works in the symbols list, the documents list, the keybindings groups in the prefs, etc. Anywhere the item has children and the double-click action isn't overriden I guess.