Panel Start / Cells
With "Insert" happens exactly what you would expect from the symbol. Here you can select whether a row, a column or an additional list sheet is to be inserted.
Panel Start / Cells / Insert
With "Delete" you can determine whether a row, a column or the entire list sheet should be deleted.
Panel Start / Cells / Delete
When deleting a sheet, you will get the hint about the finality of your wish.
If you haven't found what you want for the style of the cells or the sheet among the options presented, the formatting menu will certainly help you. The formatting options are explained by reading the pullout menu, so you should quickly get the desired result.
Panel Start / Cells / other formatting options