If you use the searchbox at the top (above the font options)… let’s say you type “hello” and hit enter, then go to full project search…
The binder’s searchbox does not ever match the other searchbox. So by default it will be empty and even though you clicked “full project search” you’ll have no search results.
Even more confusingly, if you already searched a different word, e.g. “bye” the binder searchbox will have that previous search term in it and will show results for “bye” not “hello”