I cannot set custom configuration for the CSO to watch specific namespaces.
In the github official repo it's mentioned that the user can setup custom config but it's not clear how.
https://github.com/quay/container-security-operator#example-config

Installed on OCP: 4.3 via the Operatorhub console as described here: https://access.redhat.com/documentation/en-us/red_hat_quay/3.2/html/manage_red_hat_quay/container-security-operator-setup