Can't Delete Environments

I created 2 environments on the dashboard that I no longer want (and, in fact, their presence will be confusing to my team so I really want to delete them).

Attempting to delete them always shows the error "Environment can not be deleted because the environment still has a config". But there does not seem to be any way to delete a config. Where do I delete the default config so that I can delete these environments? There seems to be no UI for this either on the dashboard nor in the editor inspector. Please advise.

Thanks!

 

I'm in the same boat.
I was using the old interface until Feb 2020. Now with the new interface, I have lost all my old settings and it's very confusing. I created "dev" follow by "Release". Now, I can't delete "dev". I tried to rename to "Development" it will just revert to "dev" again after a few clicks. :-(

Update:
I had RemoteConfig package install on my project, but I just realised, I'm still running the code with RemoteSettings. But regardless, I still can't delete the "dev" environment in the RemoteConfig dashboard.