How to unlink proxy from account?

If you need to make your account work without proxy at all, you need to disable the use of proxies globally. This is done in the section Settings - General, the checkbox Use proxy for accounts. Remove it to disable work with accounts through a proxy.

If you need to change the proxy on your account, edit the account and select a new proxy in the editing form. If during the process of editing the account you do not see the proxy selection, then check if proxy use is enabled in the system? You can check this in the section Settings - Basic, the checkbox Use proxy for accounts