Change The Column Width And Row Height - Microsoft Support

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Do one of the following:

To change the row height of one row, drag the boundary below the row heading until the row is the height that you want.
To change the row height of multiple rows, select the rows that you want to change, and then drag the boundary below one of the selected row headings.
To change the row height for all rows on the worksheet, select Select All, and then drag the boundary below any row heading.
To change the row height to fit the contents, double-click the boundary below the row heading.