(8/3/2023) As of the Official Release All the old info is obsolete you can download the file needed for party size here they give you all the directions you need to complete it very simple and easy to understand enjoy and I will post the installation here as well =) Do not hesitate to message me on steam if you need help i'm 100% cool with it and will help the best I can =)

https://www.nexusmods.com/baldursgate3/mods/327/?tab=description

Installation:
Download and unzip this mod.

Move the whole Mods folder in to your Baldurs Gate 3 Data folder. That's the game folder, not appdata. It goes here (Steam\steamapps\common\Baldurs Gate 3\Data\Mods)

(optional) Drag and drop either your bg3.exe or bg3_dx11.exe onto the PartyLimitBegonePatcher.bat file. It will create a backup for you.

That's it, enjoy the game! =)

Known issues and workarounds:

Camp sleeping bug: Use one of the awake companions and talk to Lae'zel or reduce your party size to 4 before resting.

Grymforge Map transition: Reduce your party size to 4 members before sailing with the boat. If you already used it and your characters are stuck, dismiss the ones that are with you and sail back and forth to unstuck the rest.

Note: After using the boat a timed quest is triggered and going to camp will progess it.