I would assume its loot sharing?
E.g. Master Loot , Round Robin, Random
- Master Loot : Group Leader picks all items picked by players
- Round Robin: Players will get items in turns when picked up by group members
- Random: Players will be given items that they pick up at random
E.g.
Master Loot
Player A = Group Leader Player B = Group Member
Player A = Gets all drops no matter who picks up
Round Robin
Player A = Gets item pick up one, Player B = Gets item pick up 2, and it goes round in a circle.
Random
Player A or B could get any item that is picked up by other player as it has 50/50 chance to go to them
Thats my thoughts on it
P.s The little Tick box I think would be to Enable Group rules or Not