I'm still learning certain aspects of AR. How do you resize a stencil?
Stencil move/rotate/size is done same way as rest of image, just make sure to hold cursor over the stencil when doing it.
So hold cursor atop stencil, hit Z to select zoom tool, click and drag left and right to increase/decrease size.
Dear Tony, i hold the left Alt. key down and hold down left click on mouse, slide mouse curser right or left on stencil, stencil will get bigger or smaller, am sure there are other ways