Access workspace settings through the "Settings" menu point at the bottom left-hand corner with the gear icon.
In your workspace settings, click “ Members” and follow the modal's instructions.
You can invite multiple members at once, of course.
This action added members to your entire workspace. You can also adjust their access and user roles at the Project level.
The workspace access levels you can assign to members:
Member - Can perform actions on Emails, and Templates (design and content as well) without Workspace Settings access.
Content Manager - Can access all content and perform actions related to content: add/manage integrations, merge tags, and fonts, edit the Design System, and add/manage Projects.
Administrator - Can do all that can be done - even changing workspace settings, managing member access and roles, and access billing.
Project-level access and Roles
If you want to control individually who can access certain projects or what Role they have on those projects (which can be different than workspace access), you need to control their rights at the Project-level Member Role settings.
You can find that by clicking settings from the menu next to the Member list on top of a Project (root folder).
These are the Roles and access levels you can link to Projects individually.