While accessing the multiple tenant at the same time, unable to use both the tenant until logout the first tenant and login again with another one. Is there any solution available for this in Orchestrator 2020.
Could you clarify whether you mean the Orchestrator tenant or the Cloud Accounts?
You should be normally able to switch between tenants on the fly by clicking on your profile icon and choosing it from the dropdown menu.
For two or more Cloud accounts, it could be achieved with different web browser profiles, i.e. in Chrome.