You can search for assignments using a search bar at the top of the planning page. The search will find assignments with matchings names, descriptions, attachments, or assignment types. For example, searching for "test" returns all of the course's tests, as well as any assignments that have the word "test" in their description. Follow these instructions to search for an assignment.
Navigate to the Plan page in the top bar.
Click Plan Assignments on the course in which you'd like to search.
Mobile: If you're on a smaller screen (e.g. tablets, phones), navigate to the "All tab".
Start typing in the search bar at the top of the screen.