If you want to give Collaborators the ability to join the project without an invite, you can turn this option on by going to More Options and then Settings.

Next, turn on Project Sharing which displays a link that can be shared.

Keep in mind, if you need to remove a collaborator, they can rejoin the project as long as they have the URL to join. Therefore, if you need a little more privacy on your project, I would suggest turning this off and Inviting the Collaborators you want on the project.

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