Currently, a normal user cannot see the project participants. This is exclusively accesible by the project owner role.
There is a workaround that this person creates an issue and looks into the assign to dropdown. But this is not really a satisfying user experience.
We would like to be able to give roles the right to access the project participants list without beeing able to add or remove team members (view mode). This should be granted to all entitlements.
It could be implemented as a new right in the 'creating roles' dialogue that is attached in the screenshot. This way the project owner can assign this right to any role on the project.
A "Participants" button in the left ribbon could give access to the project members in read only access as a quick way to see the participants. It could allow a read access to roles assigned and permissions behind the roles.