How to copy Feature Definitions from one DGNLIB to another?

How do I copy Feature Definitions from one DGNLIB to another? I've tried following the steps stated here: How to copy Feature Definitions from one DGNLIB to another in Explorer in OpenRoads Designer? - OpenRoads | OpenSite Wiki - OpenRoads | OpenSite - Bentley Communities

However, I don't get the option to export, this is what comes up when I right click:

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