Clicking on the search button opens the search view; see the red rectangle in figure "The seach view". Click on the search button once more to make the search view disappear.
The search view
In order to actually search something, enter a search term into the text field on top of the search view, then press the
[Return] key or click on the arrow on the right. The example in figure
"The seach view" searches for the term
driving and finds one match.