As a user, you can use the zoom to fit button as a quick and efficient way to adjust the process you are looking at, without needing to make several changes to the zoom slider.
The zoom to fit button appears in the map beside the zoom slider. Once you click on the button, the map will zoom in/out and adjust so that all the nodes appear in the centre of the page.
If you use the zoom to fit button, all the processes you open will zoom to fit when opened. You can still use the zoom slider to zoom back in on your nodes to view the details.