Hi,
You can find all the information related how to Achieve high availability with Azure Cosmos DB and manage disaster recovery in below document.
https://learn.microsoft.com/en-us/azure/cosmos-db/high-availability
Also, please find CLI commands to Add or remove regions, Set failover priority etc.
https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/manage-with-cli#add-or-remove-regions
If the information provided above does not address your query, could you please provide further details about your ask and requirement.