How to enable enhanced viewer

Hello. Thank you for the plugin–it seems like it will be just what I’m looking for. I’ve just installed the plugin though and am trying to configure/use it for the first time. I am trying to change the Viewer Mode in GDE Settings, but I only have Standard Viewer as an option–there is no Enhanced Viewer. Was this feature removed? If not, how can I resolve this?

Thanks in advance.

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