Searching a Card on your board or across multiple boards is very simple and quick. You can search a card by entering the search string against the attribute in the ‘Search’ box available on the top-right corner of the application.
A card is first searched in the context of the current board. If it does not exist in the current board, you can choose to search globally i.e. across multiple boards.
To search for cards on a board and across multiple boards:
Searching in Comments and Replies: You can enter the search string directly in the Search box. The text is searched in the Comments and replies to a comment on the card.
Searching in Attachments: The search string is searched in the text content of the attachment file.
Searching across boards: If there is no card with matching Id or text, the message, ”No results found” is displayed. Click the Search Globally link to search on other boards. If there are matching cards, they are listed for each board. Click the required card from the list to view its details.
The search globally searches only the boards to which you have access. Thus the matching results will be displayed for the boards in which you are a team member.