Delete variable "Remote Home-Assistant"

Hi everyone,
It is the first topic for me. I hope I will be clear with you.
At the start of my project I had 2 raspberries with 2 home assistants. I had installed ‘Remote Home-Assistant’ to communicate between the 2 Raspberry.
Now I’ve deleted one raspberry (no longer working) and I find myself with a lot of variables that are not accessible but still present in my entities.
I can’t delete them all at once, so I have to do them one by one.
Could you please tell me if it’s possible to delete them more easily?
Thank you in advance.

Petro, thank you very much for your reply.
Samuel