# Geometry nodes: Viewer Group Groups of nodes are capable of acting as preview nodes. **Inspection node group:** ![](https://i.imgur.com/PTocUbr.png) **Top level node group:** ![](https://i.imgur.com/uKVj3hg.png) That is, if a group of nodes has an output node, then they can be used as preview nodes. Main change: Ability to use fast connection. The preview node operates from a more nested tree of nodes. ## Issues: How do I stop treating groups of nodes as previewable? Is it possible tosay that if a group contains a preview group node, then it is also one? How to stop the epidemic of preview nodes for all groups in the project?