Starlink does not do load balancing or switching, instead both terminals will be active utilizing time division duplexing.

third-party edge routers can be used to support load balancing. If using this type of set up, you can bypass the Starlink routers, and connect both dishes to the third-party router. If load balancing is supported, then the router will automatically switch its connection to the dish provided the best level of service in the moment.