Is it possible to use Custom plane as a Section View?
If you right click on Section 1 Front Plane and Clear Selections, can you not then select Plane1?
Did you try to select the plane and see what happens or am I miss understanding your question?
Change section method to planar. I do not mess around with this functionality very often so I do not know what zonal is and my default is planar. I would look more into it but have other places to be right now. Later.
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