Orthographic projection uses parallel viewing rays, so an object’s displayed size does not shrink simply because it is farther from the camera.
A clear view of proportions
An orthographic front view is useful for comparing widths, checking alignment or laying out several components. Two equal objects remain equal in screen size at different depths, provided their orientation is the same. They can still overlap and hide one another. Removing perspective size changes does not remove depth from the underlying scene.
It is a camera choice
Switching to an orthographic view does not flatten the model or erase its depth coordinates. It changes the projection used to display it. An angled orthographic view can show several sides of a 3D object, while a straight front view can look like a flat drawing. The final exported or published camera may use a different projection from the editor viewport.
Useful before publishing
For a model intended for Painta, an orthographic view in a 3D authoring tool can help check whether lettering is aligned or a frame is square. Return to the actual visitor view to judge how it feels in AR. A composition that is tidy in a technical view may still need adjustments when seen close up, from the side or through a phone camera.