I'm not entirely sure how the ruins mod loads things, but there is a drop down to select ruins. I use Fortress Ruins, since that also loads abandoned settlements. Does this also get loaded?

Hi there,

it depends on the mod. If the mod fetches an other mod's ruins to change/expand them then they are loaded, even when you choose Fortress, but otherwise only the selected ruin-set is being loaded, others are not used.

Irritating then. Why isn't it a checkbox or some such instead of a drop down to select on? Bah.

Simply because you can choose only one from many. Maybe one day I rewrite this part. But then I have to rewrite many parts of it.

This support request is not specific to this ruin-set, as it is about the "core"'s behavior on how ruin-sets are being loaded. The feature-wish however is what I can add on the TODO list. See "core": https://mods.factorio.com/mod/AbandonedRuins_updated_fork