How do I enable the Mass Edit option for a profile in Vtiger CRM?

To give a user access to the Mass Edit option in Vtiger CRM, follow these steps:

1. Log in to the CRM.
2. Click the User Menu. 
3. Select Settings. The Settings page opens.
4. Go to User Management > Profiles. The Profiles page opens.
5. Click Edit next to the profile for which you want to enable mass edit access.
6. Select the respective App.
7. Choose the relevant Module, then go to Field and Tool Privileges.
8. Search for Mass Edit.
9. Enable the Mass Edit checkbox.
10. Click Save.

Once saved, users with that profile will have access to the Mass Edit feature in the selected module.