 sheikh alrais may god have mercy on him said the difference between the two parts is the inclusion of the solid veil until he said so he made the folding a support for it.
قال الشيخ الرئيس رحمة الله عليه وفرق ما بين الجزأين باندراج الحجاب الصلب إلى قوله فجعل الطي دعامة لها.