LMB
RMB
DOUBLE-CLICK
MMB
There are several methods that SolidWorks utilizes the buttons on your mouse
If you were to use the modifier keys along with the LMB, you can select multiple items
This will select only the Head and the Feet
This will select the Whole Body
When you select multiple items in SolidWorks, they'll go into the "Blue Box" on the left
Using CTRL or SHIFT along with the LMB, you can select multiple items from the graphics area and view/edit that selection from the Blue Box
Pay close attention to the Titles the in the Selected Entities Blue Box: