To make it easier to create and edit structural members with multiple groups, when you select a group it highlights in the preview.
When you create structural members, you may use more than one group of selection sets of sketch entities to form the members. To provide visual feedback and let you know which sketch entities belong to a specific group, in the preview, the SOLIDWORKS software shows the group you select in a different color.
To enhance working in the graphics area, when you pause the pointer over a group member, a tooltip identifies the group.