Yes, the Digital Workspace supports Single Sign-On with the Identity Service. See Alfresco SSO Guide for more details.
The Digital Workspace does not support SAML Single Sign-On (SSO) for Alfresco Content Services. Users can login with their credentials using basic authentication, but SAML authentication must not be enforced.
See SAML Single Sign-On (SSO) Module for Alfresco Content Services for more information.