If you are reading this, you have probably attempted to delete, alter or hide one of the default fields in a module in vTigerCRM. Unfortunately this is not something that you can do from the CRM administrator panel and you will need to do it from the database.
You can use a tool like phpMyAdmin to navigate to your database and find the vtiger_field table. It will list the fields, you just need to find the one you need edited, hidden or deleted.
To hide a field, you will need to change the displaytype from 1 to 0. For example to remove the Description field, you can run the following query:
UPDATE `supportg_vtiger`.`vtiger_field` SET `displaytype` = ‘0’ WHERE `vtiger_field`.`fieldid` =36;
You can disable any field by just changing the fieldid in the above query to the field id of the one you need changed.