Where is legend enabled (v2)

Apologies: cannot see how the previous issue was closed (by mistake?)...or how to re-open it.
Here is is again:

Surely this must be obvious and I'm just missing it...

Drupal/OpenLayers6.x-2.x-dev (dec14) and just installed this one (01mar).

The docos mention "a block in a corner of a map that provides information on layers"

I've enable the "ol+blockswitcher" and specified that it run on the page where the map is displayed.

The map is displaying a number of WMS layers from a remote server.

The ol+blockswitcher does not seem to display any information at all...simply rpints out:

Map layers
Base layers
Data layers

as H2 heading text...no links, no display, nada.

Any pointers very much appreciated!