Kafka - adding multiple consumers in a group

How can we parallelize consumers i.e adding multiple consumers in a group ? Is it done using thread count parameter of consumer config ?

Are you using kstreams or the vanilla clients?

The way to scale Kafka clients (vanilla) is to add consumers to the consumer group

Thats what my question is. How to add ?

You simply spin up another instance of the app with the same consumer.group name

And how to achieve the same using Kafka Connector ( sink ) ?