Use the View > Set Non Proportional View tool to scale the view independently along the horizontal and vertical axes in orthographic windows.
This results in the model appearing squished or stretched, which may help reveal curvature problems.
Change the aspect ratio of the view (non-proportional scaling)
left and right to scale
the view horizontally, and up and down to scale the view vertically.
to scale the view horizontally
only.
to scale the view vertically
only.
You can also use the 
icon in the Viewing
Panel or the NavBar to
non-proportionally scale a view in the Perspective window.
This icon only appears after you turn off the Perspective option,
thus making the view orthographic. The use of the mouse buttons
is the same.
Toggle between proportional and non-proportional views
Once you have created a non-proportional view with View > Set Non Proportional View, you can use View > Toggle Non Proportional View to switch back and forth between your non-proportional and proportional view. No other aspects of the camera view are changed when using this tool.
is displayed in the lower
left hand corner of the window when the view is non proportional.
When saving the file, both the proportional and non-proportional views are saved, and the toggle still operates properly after the file is re-opened. This is also the case when saving only the window layout with Layouts > User Windows > Save Current Layout and retrieving it with Layouts > User Windows > Retrieve Layout.
