Changes to the internal load balancer are managed through Container Apps. If you want to modify the load balancer you need to update container apps. Though you do not have the full options exposed through Container Apps.

However, it sounds like you want to disable session affinity. Did you tried setting it over the ingress configuration? https://learn.microsoft.com/en-us/azure/container-apps/sticky-sessions?pivots=azure-portal#configure-session-affinity