You can share a form with others to allow them to edit, view, or use it as a starting point for building their own form.
To share a form, click on the three dots in the top right and choose Share this Project, then type in the username of the other user(s). Here you can specify whether the user should be able to just View the form or if they should also be able to Edit it.
Once it is shared you'll then find that form in the second user's account. From there the other user can view or clone the form, and if given Edit rights, they can make changes to it as an administrator of the project.

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