Disclaimer: I am very new to Odoo. So I maybe missing something ob

Note: I am running Odoo 13. 

I am trying to disable chatter for certain user groups.

Currently the XML file contains this code:-

<div class="oe_chatter">
    <field name="message_follower_ids" widget="mail_followers" groups="generic_request.group_ims_moderator"/>
    <field name="activity_ids" widget="mail_activity" groups="generic_request.group_ims_moderator"/>
    <field name="message_ids" widget="mail_thread" groups="generic_request.group_ims_moderator"/>
</div>

As you can see, I only want the chatter to be visible to 'group_ims_moderator'. But it's like the groups attribute has no effect. I am able to see the chatter on all user groups, including basic users. Is there anything else I need to modify in other files in order to get this to work.