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Party size mods?
(lemm.ee)
Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power. (Website)
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Thank you!
Oh and I think you need to have 3 or less people in the party when you make the size change. Not 100%, but I remember doing it so it may have been necessary.
I found this in the comments of the Party Limit Begone mod by the way.