Note
NOTE: modeladmin only provides ‘create’, ‘edit’ and ‘delete’ functionality for non page type models (models that do not extend wagtailcore.models.Page). If your model is a ‘page type’ model, customising any of the following will not have any effect:
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https://docs.wagtail.org/en/stable/reference/contrib/modeladmin/create_edit_delete_views.html