Each time a new collection is opened, I wish the Visual Query Builder section would be open, or at the very least, remember whether or not I had it opened in my last collection and/or the last time I opened the same collection.

I suppose another option would be a simple setting to say whether or not you want it to be open/closed by default when a collection is opened.

(After all, there's a setting for "Auto-expand first document in tree view"... I think this would be even more useful of a setting!)