Please add a Clear button added to the Search tab.
Click on the magnifying glass inside the search box. It should be your first option.
I hadn't noticed this tiny little circle, but now I have I can indeed see that it will clear the search field. However, I'm really asking for a real button labeled "Clear" above the search field. It would clear the field AND restore the contact sheet to what was there before. In other words, undo the search. Don't you feel that would be useful, intuitive, and be consistent with what we have in the Filter and Browse panes?