The table adjustment steps are as follows:

1. Select the column label position, right-click and select Insert Column, you can quickly choose to insert any number column in front of the current column.

2. Select the row or column you want to hide, right-click and select Hide. To unhide, you need to select the rows and columns on the left and right sides of the hidden row or column, and then right-click to unhide.

3. Place the mouse on the lower right corner of the cell, and a solid black cross-shaped fill handle will appear. Pull down to fill the data, or you can double-click the fill method.

4. Enter "=A1+A2" in the formula display bar and click Enter to complete the calculation.