If you installed Studio on multiple nodes, you need to set up a load balancer in front of them to ensure that user requests are always routed to available nodes.
There are many load balancing options available. Oracle recommends an external HTTP load balancer, but you can use whatever option is best suited to your needs and available resources. Just be sure the option you choose uses session affinity (also called sticky sessions).
Session affinity forces all requests from a given session to be routed to the same node, resulting in one session token. Without this, requests from a single session could be handled by multiple nodes, which would create multiple session tokens.