To resize a structure in the Structure Editor:

1. Select the structure/or part of structure you wish to resize.
   
2. Click the Resize button , or select the Structure | Resize menu item.
   
   
3. Drag one of the small rectangles on the structure edge until the new size is achieved.
   
   
4. Release the mouse button.

Note: If you drag one of the diagonal rectangles the aspect ratio will be kept constant during structure resizing.