Display Only Sticky Notification in Odoo15

display_sticky_notification_odoo.py

def cmd_send_notification(self):
    return {
        'type': 'ir.actions.client',
        'tag': 'display_notification',
        'params': {
            'title': _('Your Custom Notification Title'),
            'message': 'Your Custom Message...',
            'sticky': False,
        }
    }