Hi,
It's also not possible. You can create more frontend submission forms (pages) with many meta boxes (field groups) to create posts, but the frontend dashboard only allows editing posts from one frontend submission page.
Or you can add multiple meta box IDs to the frontend to allow users to fill all the fields when creating a post. For example:
[mb_frontend_form id="meta-box-id1,meta-box-id2,meta-box-id3" post_fields="title,content"]
Get more details here https://docs.metabox.io/extensions/mb-frontend-submission/#shortcode-attributes