For nodes entities the "Layout for..." vertical tab provided by Display Suite is available in both "Manage fields" and "Manage display". This applies also to any node content type I created, so I'm able to rearrange forms layouts used when adding\editing and when viewing nodes.
But for field collections the "Layout for ..." vertical tab is missing in "Manage fields" and it's available only in "Manage display", so I'm not able to rearrange the layout used by the add\edit form specific to field collections.
Is this a limitation of Display Suite? Any other way to rearrange the edit\add form for field collections fields?