According to what is written Quick Search option is intended to display search bar only when a source text fragment is marked. But it seems it doesn't work, unless I don't understand the essence of the function.
Wojciech: According to what is written...
Where? On the wall?
I'm not sure if I understand your question, but there are two ways to search: In the Menu, offering more choices, or in the search bar in the GUI. The latter works as advertised (and so does the former, by the way): Enter a SL term by double clicking it, or enter any term by typing or pasting it. Then, hit one of the buttons next to the bar to select what resource you want to search in either SL or TL.
Wojciech is referring to the tool tips displayed in the status bar at the bottom of the interface. A few of them needs updating to reflect the most recent changes.
I give up.