[Orgmode] Separate first headings by empty line

[Simao M]

Hello,

I would like to separate all my first headings with a blank line, even
aftet collapsing and expanding all the headings, e.g.:

* Main
** Heading


* Main 2
** Heading


* Main 3
** Heading

But after collapsing I get:

* Main...
* Main 2...
* Main 3...

And I would like to have:
* Main...

* Main 2...

* Main 3...

Is there any way to do this?

Thank you for your help.