Currently the interface for adding a new entity cannot be modified or customized without affecting the order of the fields in the main entity page.
Also the most important section "additional settings" is at the bottom. If the user fills out all fields and then realizes that language/country are not correct, changing that selection will cause to eliminate all data previously added.
It would be ideal if users could customise the order of the fields and which fields can be shown only for this section.
The only workaround is to make sure to inform the client about that they should complete first "additional settings" at the bottom of the page and that the field order cannot be changed without affecting the single entity page.