When a Scheme adds an extra Henchmen group in solo play, do you add 3 cards or the whole group?

Question

Accepted Answer

Most players add three cards from that group, as the solo setup does, unless the Scheme gives a different number. Some solo leagues add the whole group, which is a variant, not the printed rule.

Legendary: A Marvel Deck Building Game

When a Scheme adds an extra Henchmen group in solo play, do you add 3 cards or the whole group?