Conditional Workflow in Postman means that Sequence of the request - If this happen then this happen else this happen is workflow.
Specify the name of the subsequent request.
To terminates execution.postman.setNextRequest(null);
setNextRequest() is always executed at the end of the current script. This means that if you put setNextRequest() before other code blocks, these blocks will still be executed.
setNextRequest() has a scope, which is the source of your collection run. This means that if you run a collection, you can jump to any request in the collection (even requests inside folders, using the same syntax). However, if you run a folder, the scope of setNextRequest() is limited to that folder. This means that you can jump to any request within this folder, but not ones that are outside of the folder.