Item SharingIn a
Party/Expedition, the group leader can set item sharing to Free-For-All, Round Robin, or Instant Auction.
To change the sharing method, the leader needs to right-click the center of the core gauge and select 'Item Sharing' to open up an extended menu.
This is the Core Gauge

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Free-For-All: The player who picks up the item first acquires it.
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Round Robin: All players take turns in acquiring an item.
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Instant Auction: When an item is "auctionable" or higher in grade, the player who places the highest automatic bid acquires the item.
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Dice Distribution - Each member of the group can roll the dice and the one with highest number gets the item
You can control this through the Party tab which appears when you press the
O key.