Although you can define multiple quick create forms, only one quick create form can be used by everyone. The form everyone will use is set using the form order. Quick create forms cannot be assigned to security roles and they do not provide the capability for the user to switch forms.

https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/create-edit-quick-create-forms#create-a-quick-create-form

• I Wish I Would Have Known