Hi @silogmi1,
Thanks for the inquiry, and welcome to the Roku Community!
Please be advised that a Roku device cannot directly display Samsung DeX, but you can use screen mirroring to connect a Samsung phone to a Roku TV.
For more information, check out this support article on how to screen mirror from your phone, tablet, or computer to your Roku streaming device.
We hope this helps. Please let us know if there's anything else we can do to assist you.
Best,
The Roku Community Team
John
Roku Community Moderator