Admin Settings

You can turn off login alerts for all users and agents by heading to Sidebar Menu → Settings → General

And on that page, search for User Login Alert and from drop-down select Disabled and save changes.

User Settings

If an admin has enabled this option, then an individual user can turn off login alert notification.

Go to Sidebar Menu → Profile → Notification Settings, select disable for login alert field and save.

WhatsApp Agents:

Master agent can turn off agent’s login alert notifications by editing agent’s profile, select disable for login alert field and save.