Hiding closed accounts, which is now there, is terrific. It gives me what I need right now.
However, some people have requested the ability to hide -any- account, so I created this idea post to collect votes. I think this might be under Settings→Accounts, and there would be a menu setting on each account to hide an account (maybe checked/unchecked). For hidden accounts, I might like the option to pull up the account registers from settings→accounts.