Hi Cynthia Wood1,
Thank you for reaching Microsoft Community.
The Surface pro 8 uses its USB-C port (Thunderbolt 4) for external display including a projector. Please see this page for details in connecting Surface to an external display: Connect Surface to a TV, monitor, or projector - Microsoft Support
You may also see this other article about troubleshooting when connecting Surface to external display: Troubleshoot connecting Surface to an external display - Microsoft Support
Hope this helps.
Kind regards,
Marrion