In the Logging into the Argo CD instance the 3rd point it says Navigate to the Developer perspective.

We should mention that to navigate the user should click the Administrator drop-down and select Developer perspective since the option is not directly visible on the UI. 

Page link: https://docs.openshift.com/container-platform/4.8/cicd/gitops/configuring_argo_cd_to_recursively_sync_a_git_repository_with_your_application/configuring-an-openshift-cluster-by-deploying-an-application-with-cluster-configurations.html#logging-in-to-the-argo-cd-instance-by-using-your-openshift-credentials_configuring-an-openshift-cluster-by-deploying-an-application-with-cluster-configurations