Groups keep together selected objects, so that they can be moved or formatted as a single object.
To edit the individual objects of a group, select the group, right-click, and then choose Enter GroupGroup - Enter Group
When you are editing a group, the objects that are not part of the group are faded.
Use Tab and Shift+Tab to move forwards and backwards through the objects in a group.
To exit a group, right-click, and then choose Exit GroupGroup - Exit Group