Find the sizing and shelf limits of an L-corner unit
Open an L-corner unit's Customize > Rules to see its Sizing Rules and Shelf Restriction tabs, where Available Space holds Min and Max depth, width and height.
An L-corner unit's Customize > Rules has two tabs, Sizing Rules and Shelf Restriction.
Shelf Restriction > Available Space holds Min and Max depth, width and height (each reads 'Not Set' on a newly placed L-corner unit).