Since you don’t "download" them in the traditional sense, you access them through the console's personalization settings: Press the to open the guide.
Navigate to > Settings > General > Personalization . Select My background and then Dynamic backgrounds .
Browse the categories, including , Xbox , and Abstract , and press A to apply your choice. Types of Available Dynamic Backgrounds
The Xbox Series X supports dynamic backgrounds, but they cannot be downloaded from the internet or third-party sites like standard wallpapers. Instead, these animated themes are built directly into the console's operating system and are updated periodically by Microsoft.