By default, your dashboard will show views and visitors from the past 30 days.
To change the date range, click on the date picker button on the left side of the toolbar.

Inside the date picker, you can click one of the pre-defined date ranges, or manually select two days to define a custom date range.

When you’re happy with your selection, click the Apply button at the bottom of the calendar and the dashboard will update right away with your new data.