It is possible to hide the panel for the experimental QGIS plug-in 'OSM place search' - but the panel is not listed (to re-display) under the menu item View | Panels. How can it be re-displayed?
There turn out to be two methods (more?) to see the list of available 'panels' in QGIS. One is through the main menu: View | Panels The other is to 'right click' on a toolbar. The check box for OSM Place Search is available using the second method, but not the first.
NB: This is also the case for at least one other panel I can see (undo/redo).