I simulated your case. You are right, we are not able to remove the first table.
It may be because it is a csv? I haven’t done it in a while; but I have had cases where I had to make dataset changes that involved relational tables and I was able to remove them.
An alternative approach is to use CLI commands to update dataset properties
Personally, I haven’t tried the CLI approach. So if you are familar with CLI commands you may try this option and see if you could replace the Quality_CSV with Quality_Testing_S3 with the CLI command
Regards,
Giri