The search feature in the Feature Board hides all other cards (essentially acting as a filter).
This is problematic, as whilst you have then found the feature you're looking for, you have no ability to rank it within the feature board.
So far the only workaround for this (which is clunky, and slow) is to manually use the browser's "Find" function but using the browser navigation bar. If you use the keyboard shortcut like CTRL+F it still uses the Aha! feature search filter.