At times you may wish to allow some specific users to play a specific role on your project and assign them certain privileges.
For example, you may want a user to be an additional PM on this project who can view project, however not add New tasks in it. To do this

Go to your project and click on More option on the right side.
Now, click on Access Control.
You can add a user to play a particular role by clicking on the User icon.
You can then set the security per role. The changes are saved automatically.

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