You can invite people to collaborate on a Freeform board in iCloud, and everyone will see the latest changes when they’re online and to start a new one), then tap Go to the Freeform app to move through the changes you made on your own iPhone. To redo a change after you undo it, touch and hold , then tap Manage Shared Board.Do any of the following:Remove people: Tap the name of the participant you want to remove, then tap Remove Access.Remove yourself from someone else’s board: Tap your name, then tap Remove Me.Stop sharing with everyone: Tap Stop Sharing, then tap Stop Sharing.When you choose this option, the board no longer appears on the devices of the other participants, even though you still have access to it.
Go to the Freeform app to move through the changes you made on your own iPhone. To redo a change after you undo it, touch and hold , then tap Manage Shared Board.
Do any of the following:
Remove people: Tap the name of the participant you want to remove, then tap Remove Access.
Remove yourself from someone else’s board: Tap your name, then tap Remove Me.
Stop sharing with everyone: Tap Stop Sharing, then tap Stop Sharing.
When you choose this option, the board no longer appears on the devices of the other participants, even though you still have access to it.
You can change access and permissions for individuals or for everyone after you’ve started sharing a board. See Collaborate on projects with Messages on iPhone