When the "Find.." buton is clicked, a text pane is shown for inputing the words we want to search. This function can also be achieved by "ctrl+f".
For example, when we input "motor" and click "Find" button, the matched words are highlighted in scenes. "<" and ">" button are used to go to next or previous matched word(s).
The text pane can be hided by clicking "Hide" button or pressing Escape(Esc) key on the keyboard.