Many of those plugins are no more installed and were deactivated and then files were removed by me. These settings are still appearing. How to remove them?
You can do this in database
You must check group settings id (gid) in TABLE_PTEFIX_settinggroup, remove group settings and remove settings from TABLE_PTEFIX_settings where gid is settinggroup gid
Can you please explain step by step or tell me a more easy method? Would be helpful.
my English is not very good but I try help you
go to your acp to plugins settings
http://i.imgur.com/4Ci0u36.png
On the end url you can see GID
Now go to phpmyadmin and rn query
DELETE FROM `DataBaeName`.`mybb_settinggroups` WHERE `mybb_settinggroups`.`gid` = GID;
DELETE FROM `DataBaeName`.`mybb_settings` WHERE `mybb_settings`.`gid` = GID;
better way is rebuild_settings() after delete settings, give me here all GIDs