Click the period button at the top of the page (it shows the current period, for example Today) to open the Select period window. The preset options are: Today, Yesterday, This week, Last 7 days, Last 30 days, This month, Last month and Maximum. For a specific range, choose Custom and click the start and end days on the calendar. Then click Update to apply. All metrics in the table, the Period Summary and exports will reflect the selected period. The Refresh button next to the period reloads the data straight from Meta at any time.