Under Text autofitting, select the option you want.
Note You can also reduce the size of the margin between the text and the border of the shape.
- Right-click the selection rectangle of the shape you want to change.
- On the shortcut menu, click Format AutoShape.
- In the Format AutoShape dialog box, click the Text Box tab.
- Under Text Box Margins, adjust the measurements to increase or decrease the distance between the text and the outer border of the shape.