Remove the large space when searching region list

Collapse the tool bar when we're doing search for
a better user experience.
And we don't allow user can expand the tool bar at this moment
since it will see a large space at this moment.

Fix: 181741353
Test: Open the page and don't see a huge space now.
Change-Id: Iec5ebe9b22a2aad15dc8cf90113a64c358ee447e