Right click on the "Crosshair" box (top left of the table) and select “Table Properties” from the popup menu.
NOTE: If you don’t want to freeze all the cells in the table, select the rows, columns, or cells you want to freeze, right-click on the the selected cells, and select “Table Properties” from the popup menu.
On the “Table Properties” dialog box, click the “Row” tab.
Enter the size you want for the height of the row(s) in the “Specify height” edit box and then select “Exactly” from the “Row height is” drop-down list.
Click on the “Table” tab.
Click the “Options” button.
On the “Table Options” dialog box, in the “Options” section, click the “Automatically resize to fit contents” check box so there is NO check mark in the box. Click “OK”.
Click “OK” on the “Table Properties” dialog box to close it.
If you don’t turn off the “Automatically resize to fit contents” option, Word will adjust the column width of your tables to display your data in the best way possible.