Today, when one of these three customizations exists on a form inside a list or library that's configured to use the SharePoint modern experience, those forms will continue to render in classic to ensure customizations are visible to all users.
Set the ContentType.EditFormUrl or ContentType.NewFormUrl properties to point to a custom form URL.Classic list and library forms support the following customizations: SeptemWe are changing how customized forms work inside SharePoint lists and libraries that will affect those using the SharePoint classic experience. Login: Changes in Classic Form Customizations in Modern Lists and Libraries SharePoint is an online collaboration tool where employees can efficiently collaborate with team members, share knowledge, and find organizational resources and information.
