How do I clear the search list?

When I click on the search panel I am given a choice of either keying in the name of a show or of choosing from a list of
shows I have selected in the past. The list is totally out of date but I cannot find any way of clearing it. Does anyone
know how to do this?

DT

On Chromium based browsers, highlighting an entry in the list with the mouse, holding shift and pressing delete removes
one entry at a a time. Pressing the down arrow quickly selects the next entry to remove it easily as well. You might have a
lot of history to delete, as the whole list is never shown after it gets over that five or six.

Otherwise, deleting all the site settings might work.