You can zoom in on part of the drawing or to move it. while Double-clicking on the drawing the software will center the Double.click drawing
automatically: To center the drawing with the screen.While clicking in the tree of posting of the layers, you visualize to bush-hammer it corresponding or if you click on the root you will see all the layers.
The set knobs make it possible to handle the drawing
: Displacement : Zoom by a rectangle : Zoom more : Zoom less