You may need to rotate contents to have the best fit your work, especially when working with a chart where the horizontal axis has long names. Please follow the steps below to rotate content angle clockwise:
Step 1: Select the contents you need to rotate, in this example, the x-axis;
Step 2: Click the "Home" Tab from Ribbon;
Step 3: Click the small triangle after Orientation command, then select "Angle Clockwise";
Step 4: The selected contents will rotate.