How to zoom in/out the diagram?

There's multiple ways to modify the zoom to the diagram. These are:

• Scroll the mouse wheel, or click on the "+"/"-" buttons to zoom in, our out respectively.
• Reset the zoom clicking on the Reset Zoom icon (Figure 1).
• Use the Zoom to Fit icon (Figure 2) to fill all diagram elements in your visible area.
• Configure the zoom level by specifiying a number (Figure 3) that is on the left bottom of the diagram area.

Figure 3. The zoom level is highlighted on the left bottom of the diagram area.