If you clicked an axis or axis title, click Selected Axis or Selected Axis Title on the Format menu.
If you don't see the Alignment tab, click Cancel, click outside of the text you want to format, and then repeat the procedure.
Note When you have more than one level of category axis labels, only the first level (the level closest to the axis) can be rotated.
To quickly rotate selected text 45 degrees up or down, click Angle Text Upward or Angle Text Downward on the Chart toolbar.