This change to nosamplecontent was made in AEM 6.1 itself and carried over in 6.2, see [1].To enable crx/de back, there are simple steps as Kanika also mentioned.But if you're only looking to get rid of geometrixx and do not require other security settings enforced by nosamplecontent, you may want t...

Verify using crxde that the following renderer JSP is present & not blank:/libs/cq/replication/components/treeactivation/treeactivation.jspSometimes cleaning up /var/classes may also help. Because tree activation is at the same place as in earlier AEM versions:https://docs.adobe.com/docs/en/aem/6-1/...