To Change the View Orientation of a Structure
There are three ways to change the view orientation in an open structure or figure.
• From the Ribbon:
a. Click > . The Orientation list opens.
b. Click a view orientation from the list. The view orientation changes.
• From the Custom View Orientations dialog box:
a. On the Home tab in the Navigation group or on the Structure tab in the Parts group, click Orientation. The Orientation list opens.
b. Click Customize. The Custom View Orientations dialog box opens.
c. Click a view orientation in the list, then either right-click and choose Activate Orientation from the shortcut menu, or click 
on the Custom View Orientations dialog box. The view orientation changes, but the Custom View Orientations dialog box remains open, so you can repeat this step to compare view orientations.
on the Custom View Orientations dialog box. The view orientation changes, but the Custom View Orientations dialog box remains open, so you can repeat this step to compare view orientations.• From the keyboard shortcuts in some of the standard view orientations: Click in the graphics area, and then press the keyboard shortcut letter that appears on the Orientation list.