For that select the customize quick access toolbar button and click on the command you want to add to the toolbar. The x-axis is represented by a linear. By clicking the arrow at the end of the formula bar By expanding the mouse pointer selection with the two-headed arrow By right-clicking the formula bar select the option from the drop menu The alternate option is to use keyboard shortcut Ctrl Shift U.
To show formulas in all cells press CTRL that little mark is the grave accent mark key.
On the right hand side of the Formula Bar there is a expand or contract toggle. On the Home tab in the Clipboard group click Copy. You can also use the Formula Bar option from the View tab of the ribbon. Quick access to Excel formula bar via keyboard.