You can drag the triad to modify the geometry in two ways:
- Select an axis or the plane on the triad, and then drag the geometry along that axis or in that plane.
Video: Select Triad Axes
Video: Select Triad Planes
- Drag the triad onto a point.
It locks to that point, and then you can drag the point by dragging on the axis or plane of the triad. While the triad is locked, you can still drag other geometry.
Video: Lock to Point