2-Side Picking - Choose this mode to enable the ability to select mesh nodes (or polygonal faces for flipping) from both their front or back (transparent) side.
Grid (Ctrl + G) - Press this button to show / hide the gird on the floor. The size for each grid is 100 x 100 units.
World Axis (Ctrl + A) - Press this button to show / hide the world axis (0, 0, 0). The Red / Green / Blue line represent the X / Y / Z axis
Dummy (Ctrl + D) - Press this button to show / hide a dummy (same size as the default character in iClone ) in the center of the scene as a scale reference for imported models. The dummy can neither be edited nor exported. Video Tutorial
Shadow - Press this button to show / hide the shadow.
Show Normal - Press this button to show / hide the normal for each mesh face.
Wire Frame - Press this button to show / hide the wire frame of the selected node or nodes.
Bounding Box - Press this button to show / hide the bounding box of the selected node or nodes.