Hi kangyi!
Thanks for reaching Microsoft Community. We're here to help and let's work on this together.
It seems that you are experiencing issues with the Surface Thunderbolt 4 dock when connecting it to your XPS 9300 laptop.
Firstly, please ensure that your XPS 9300 laptop has the latest Thunderbolt 3 drivers installed. You can download the latest drivers from the Dell website.
Secondly, please ensure that the Thunderbolt 3 port on your XPS 9300 laptop supports dual 4K displays. If it does not, you may need to use a different port or consider upgrading your laptop.
Thirdly, please ensure that the Thunderbolt 4 dock is compatible with your XPS 9300 laptop. You can check the compatibility on the Microsoft website.
If the above steps do not resolve the issue, please contact Dell customer support for further assistance as they may be able to provide more specific troubleshooting steps for your XPS 9300 laptop.
I hope this helps! Let me know if you have any further questions or concerns.
Greetings,
RodelioP.