OmniLink - how to delete hundreds of un-used entities

I am using the Omnilink add-on and it works great re: connectivity and controlling the panel.

The problem is it created 400+ entities; many as duplicates and old, unused zones and buttons. Without doing this on the alarm panel and re-syncing, how can i delete them in HA? I go to the entitiy, but delete is grayed out.

Thanks!