With the title still selected, click the Center alignment button on the Formatting toolbar. Click the Columns tool on the Standard toolbar and choose one column, as shown below.
In 'Table Tools' click the Layout tab locate the 'Cell Size' group and choose from of the following options: To fit the columns to the text (or page margins if cells are empty), click AutoFit select 'AutoFit Contents.' To fit the table to the text, click AutoFit. To adjust table row and column size in Word: Click anywhere in the table.