I've created a concept assemblage as can be seen from one of the images. However, when I click on a concept, select the assemblage, the field to enter the concept for specialty is not available.
I suspect a misconfiguration error here.
The first thing I notice is that the extension in the screenshot is of type MBR (Member), not of type REF (referenced component). So I would not expect an ability to select a concept. I've uploaded an example of an action configuration that I just created to allow addition of a reference to a concept.
In the case of this screenshot, I've added "retroid", "or", and "equal to" as concept options. When you add the extension, the ability to select a new concept from the choices is added, in addition, you can use find, or taxonomy or search history.
You're right. Here you need to place a concept in the Preferences before it'll show you the option in the concept.
This can be closed.