The Print button has a single and pretty straightforward functionality: it will print your dashboard.
After clicking on the Print button, you will see a standard Windows Print window, where you can select and configure a printer, and set the number of copies to be printed.
As we can see, the only specific settings for this component were the Print Scale option. The default Scale to fit page option makes sure that the dashboard fits on a single page. If you select the other option and scale the dashboard to a certain percentage, it might be using more than one page to be printed on.