The default views in Tracker list all matters for which you have tasks assigned.

To pin important matters so they always appear at the top of the list, select > Pin matter tracker.

To unpin a matter, hover over it, and select  or select  > Unpin matter tracker. Unpinning a matter with no tasks assigned to you removes it from the list.

Additionally, in the Outlook panel, you can pin matters that you want to be listed even when no tasks are assigned to you. Select   to search for a matter or select one from the lists displayed. If a tracker isn't created for a matter, select OK when prompted to create one. The matter is added to the list displayed on the Tasks tab.