If you have enabled LoginShare for staff and due to any reason, you are unable to login at Admin CP because of LoginShare, you can disable staff LoginShare from database.
For this you need to make changes in ‘swsettings’ table and set the value of "loginshare_staffenable" field as 0.
MySQL query:
UPDATE `swsettings` SET DATA = 0 WHERE vkey = 'loginshare_staffenable';
Once done, rebuild the help desk cache, using the URL: http://yourdomain.com/staff/index.php?/Core/Default/RebuildCache
Sukhpreet Anand