CustomVisualizations properties gear icon does not appear.
In the attached image, you can see the properties (gear) icon is available for the native Table visualization (WebPlayer) so I can edit properties of the visualization.
However, the gear icon is NOT available on my custom visualization (WebPlayer), so I cannot currently access the properties of the visualization.
This all works fine in the Desktop version. But not in the WebPlayer. This request is for feature parity.