To use the AutoCalculate area,select the range of cells containing the numbers for a calculation you want to verify and then press and hold or double-click the AutoCalculate area to display the Customize Status Bar shortcut menu.

The AutoCalculate area automatically displays the sum of selected cells in Excel, but you don't need to press, hold, or double-click it to use it or to display the Customize Status Bar shortcut menu. You simply select the cells, and the calculation appears in the AutoCalculate area on the status bar. To customize the status bar, you right-click on the status bar itself, not the AutoCalculate area.