The intial view provides all the projects and tasks in your SharePoint site selections.
Additional information regarding task assignments is available by clicking open the 'People' pane. Click on the bottom left expander to open this pane.
When you click on a particular project, only participants within that project are visible.
When you click on a person, thereby selecting them, your tasks are filtered such that the selected person must be assigned.
You can click on multiple people so that multiple assignment filters are active.
To return to an unfiltered list, click on the selected people so that they are no longer selected.