Using Business Intelligence Dashboard Designer : Creating a New Dashboard : Rotating Chart Axis Labels
  

Rotating Chart Axis Labels

If your chart axis labels become unreadable because they are too long, Label Rotation may correct the problem.
1. In the Chart Designer window, display your chart.
2. Under Label Rotation, select Diagonal or Vertical and click Apply. The labels display with the rotation you set.
3. Click OK to display the chart in the dashboard panel.