Hi,

You could check the group of the user logged in in the snippet block. 

Eg:

<t t-snippet=“module_name.snippet_template_name”

    t-if=“request.env.user.has_group(‘base.group_portal’)” t-thumbnail=“thumbnail image link”/>

The above snippet block will only be available for portal user.

<t t-snippet=“module_name.snippet_template_name”

    t-if=“request.env.user.has_group(‘base.user_admin’)” t-thumbnail=“thumbnail image link”/>

The above snippet block will be available for admin user

Regards