The Order Status histogram shows the past seven days' Unshipped, Shipped, Cancelled, and Pending orders represented as single bars for each day. The first bar on the right shows the data of the current day with a starting point at 12:00 am midnight. As the day ends, the current day's bar will move one step to the left and be replaced by a new one.
You can click on each tag on top of the chart to strike it out and remove its count from the bars. Click the tag again to add it back.