Search
The search field at the top of every page (accessible by clicking Ctrl+K) will allow you to search for entries in the campaign based on their names, or do a full-text search.
By default, it opens with no results, but shows the campaign [bookmarks] and lists.

Type in the search field to find for entries with that name.
Full text
You can enable full-text search by clicking on “everywhere” on the top-right of the dialog. Read more about full-text search.