Custom Roles Is it possible to limit access of users to specific projects in their "workspace" using "Custom Roles" in the enterprise edition ? If yes, is there an example? I do not see it in https://docs.prefect.io/orchestration/rbac/overview.html

No to specific projects in a Tenant. It’s more just like blocking them from reading or writing. 2.0 will have better controls in that you can have multiple Workspaces and add/remove people to each one like Github projects