Next to the disk is the group display icon.
If this icon is clicked with the left mouse button, the skills of all four droids are displayed. This is useful to see which droid needs more skills than the others.
If this icon is clicked with the right mouse button, the inventory and status of all four droids are displayed. This is useful to exchange items between droids.
While the group status is displayed, you can click the name of any droid to toggle between inventory and skills display.