No Search option if adding the PDF Viewer as a gadget in a Dashboard page

Steps to reproduce:

1. Add PDF Viewer with Extension Manger
2. In a Dashboard page add a PDF as an attachment
3. Add the PDF Viewer as a gadget, with the PDF attached above

Expected results: The search appears.

Actual results: Search doesn't appear if you add the PDF Viewer as a gadget.

NOTE: I've noticed that the Search disappears when I make the wiki page smaller, so I think this is the view for mobile devices.