How to delete default template?

[cvitaa11]

I want to show only my custom templates in the catalog, so I wanted to delete some default templates.
I see them all when I list them with oc get templates -n openshift , and then delete one with oc delete template redis-ephemeral -n openshift and I get success response but template is still present when I list them. Does anyone know how to solve this?

[vrutkovs]

Templates are provided by cluster-samples-operator, these cannot be modified or removed