Do any of the following:
Wrap all text in a table: Select the table. In the sidebar on the right, click the Text tab, then select the “Wrap text in cell” checkbox.
Wrap text for a row or column: Select the row or column. In the sidebar on the right, click the Text tab at the top of the sidebar, then select the “Wrap text in cell” checkbox. If you don’t see a sidebar, or it doesn’t have a Text tab, click
in the toolbar.Wrap text in a single cell: Control-click the cell, then choose Wrap Text. A checkmark appears next to Wrap Text when it’s selected.