1. First, we can open a computer-aided design drawing to demonstrate.

2. To zoom in or out on the basis of the original image, we use the mouse to select all the images, then click the right mouse button and select Zoom from the pop-up menu.

3. At this time, a prompt will appear on the page, and you need to specify a base point (the base point is the original position of the graph after scaling). We designate the marked point in the figure as the base point.

4. Then, you need to specify a scale factor. If the number is enlarged, please enter a number greater than 1. If it is decreased, please enter a number less than 1. As shown in the figure, we try to enlarge the figure and enter a scale factor of 2.

5. Right click to confirm and enlarge the figure. The effect is shown in the figure below.