Selecting multiple objects allows you to move, rotate, and scale them together. You can select objects either with the context button or the selection sphere.
When you click the trigger in the empty space—everything gets deselected.
Select or deselect objects continuously by touching them while holding a controller button.
Select objects within Box, Sphere, and Line shapes single handedly or by extruding the shape with both controllers.
When you create selection shape, holding the trigger makes arrow buttons appear. You can use those buttons to change the shape type.