You can quickly connect to a Matter on which you have recently worked by clicking on Recent Matters in the Matter menu:
To connect to a Recent Matter, select the client under Recent Clients, and then click on the Matter you want to open:
The left column of the right side of the screen lists Recent Clients. When you click on a Recent Client the right column will populate with the associated Matters. Matters are reverse sorted by the last time you connected.
You can remove a Matter from the Recent Matters list by right-clicking on the Matter and selecting Remove from list: