How to create an advanced form with multiple fieldsets (not in popup though)?

[MagePsycho]

Description

I am looking for documentation on how to create an advanced form with multiple fieldsets but on a separate page. Many Admin bundle like Sonata & EasyAdmin doesn't have the flexibility to have complex custom form.

Let me know if Umbrella is able to achieve this. If Yes, can you share some code samples?

Example

No response