So I run my software SDN controller on my Synology NAS in a Docker container.  I was pretty paranoid the first time I upgraded it from 5.0.30 to 5.1.7, so instead of upgrading the original container, I just downloaded the new 5.1.7 container and restored the 5.0.30 settings to it.  Worked great!

However, I am now ready to delete the old controller from my cloud access, but the 'delete' icon seems to have disappeared from the User interface.  I cannot find any way to remove the old unneeded Controller instance from my cloud account.

I'd like to get rid of the midle instance below (5.0.30).  How do I do this?