I just spent quite a while searching for the search operation in the interface.
I finally found it under the "Extensions" menu.
It's surprising to me to see what I think is a basic functionality in the "Extensions" area.
Of course it is no problem for me now, that i know it, but it could be for others.
Any chance to give it a more natural home in the tree, such as under "File" or "Edit"?
Another thing that caused confusion: There is an icon with a magnifying glass in the toolbar.
If my experience is anything to go by, the magnifying glass usually represents Searching.