I could solve it by now - with a little help from the Steam Community <3

Changed the settings with this mod
https://mods.factorio.com/mod/EditMapSettings

This does the trick

Hi

We continued a vanilla savegame for SpaceAge.

Now we've reached the point of "Biter egg handling" and were looking for biter nests, but couldn't find any.
We need the science for the Promethium science pack... :?

We deactivated the biters in the past, but weren't sure how. So i checked the ...