The Overview page allows you to dig deeper in the workspace and get specific insights. It does so by offering a rich selection of filters:
My Tasks and All Tasks
Quick Filters (Assigned to Me, Created by Me and Followed by Me)
Due Date (Overdue, Due This Week and Due This Month)
Status (Completed and Deleted)
You will find these filters right next to left navigation when you click the Overview icon
Click on Clear All Filters at the bottom of the filter panel on the left to clear all the filters.