From the left navigation menu, select [Discover] → Extended Search →My Searches.
Hover over a specific extended search and select [More].
Select the relevant action you want to complete.
Pause: The search will no longer continue refreshing, but the results that have already come in will still be visible.
Delete: The search and its results will be deleted.
Note: To prevent overwhelming results, searches are automatically paused if there are 100 unreviewed search results. To prevent ineffective searches, searches are also paused when they return less than 5 results.