1. Select the area with the mouse, and right-click Delete to delete the whole row or column.

2. Select the first column of the unwanted column on the right, and press Ctrl+Shift+ RIGHT ARROW key to select all the columns on the right. Right-click and select Delete.

3. Select the first line of the unwanted line below, press Ctrl+Shift+ DOWN ARROW to select all the lines below, and right-click to select Delete.