You can make multiple rows or columns the same size. All rows adjust to the height of the tallest selected row. All columns adjust to equal distances based on the width of the table. The table does not grow.
Note:
If you used the Merge Cells command, the original columns still exist but are hidden (so that you can split the cells again if you want). To make the columns the same size after you have merged cells, delete the hidden columns first by using the Table > Delete > Column command.

To distribute rows and columns evenly