There are a variety of ways to add rows and columns to your grid view. Some of the methods include:
Adding rows and columns by dragging the divider between two cells
Adding rows and columns by clicking on the divider between two cells
Adding rows and columns by clicking on a cell, then dragging it to the right or left
Pressing Ctrl+click on a cell, then dragging it to the right or left
Using the keyboard shortcut Ctrl+Alt+Left arrow key, then Right arrow key