Resize multiple rows or columns: on your Mac.
Open a document with a table, then click a cell in the row or column you want to resize.
In the Format on your Mac.
Open a document with a table, then click the table.
Move the pointer to the right of the row number or column letter, click the arrow, then choose Fit Height to Content or Fit Width to Content from the menu that appears.
Go to the Pages app Add or remove table rows and columns in Pages on Mac