The search box on the Application Bar can be used to find discussions in workboards you are allowed to see.
Necto conducts search within the names and the message texts of the discussions, and returns the most relevant search results.
To search for a discussion:
1.
Click the Search Options 
button and select Search for
Discussions.
2.
Type in the search text and click the Start
Search 
button (or press Enter):
3. To access a discussion from the results, double-click it or select it and click OK. You will navigate to the workboard where that discussion belongs, and the Discussions Pane will display the discussions of the workboard.