Within Teamwork, you can choose the default permissions that will be automatically applied when adding a new user to your site.
Click your profile icon in the top right corner of your site and select Settings from the dropdown menu.
Note: Only site administrators in the owner company can access this area.
In the Settings area, go to the Templates tab.
To the bottom of the Templates page you will see an option for New user on a project.
You can then define the permissions you want a new user to have by choosing the Change option beneath each column for the owner company, external companies and collaborators.
You can see which permissions are currently enabled for a new user via the checkmarks next to each permission.
Different default permissions can be set for users in your owner company, external companies, and collaborators.
For more information, see: Setting User Permissions on a Project