2011

As you drag the cursor, movement of the selected objects and subobjects is
constrained to the highlighted axis. You can click or enter a value to specify
the distance of the move from the base point. If you enter a value, the
movement direction of the object follows the initial direction of the cursor
movement.
Constrain the Movement to a Plane
You can use the Move gizmo to constrain the movement to a plane. Each
plane is identified by a rectangle that extends from the respective axis handles.
You can specify the plane of movement by moving the cursor over the
rectangle. When the rectangle turns yellow, click it.
As you drag the cursor, the selected objects and subobjects move only along
the highlighted plane. Click or enter a value to specify the distance of the
move from the base point.
Move 3D Objects | 555