8.2.2 Selection Method

There are two ways to select an object: click the object directly or drag the mouse to select objects inside the defined area.

To select one of the overlapping objects, click the object while pressing the [Ctrl] key. Each object becomes in the selective state in turn, and you can select the target object.
To release a particular object from the selected objects, click the target object while pressing the [Shift] key.
To add a particular object to the selected objects, click the target object while pressing the [Shift] key.