Hiding and showing border lines
You can hide and show the lines separating rows and columns in the grid.
To hide or show the border lines of a grid:
Select View > Customize View from the main menu to open the Customize View window.
Click the Options tab.
Choose any of the following:
If you want to hide border lines, click to clear the Show Grid Lines check box.
If you want to show border lines, select the Show Grid Lines check box.