odoo16/addons/mail/views/mail_message_reaction_views.xml

<?xml version="1.0"?>
<odoo>

    <record id="mail_message_reaction_view_tree" model="ir.ui.view">
        <field name="name">mail.message.reaction.tree</field>
        <field name="model">mail.message.reaction</field>
        <field name="priority">10</field>
        <field name="arch" type="xml">
            <tree string="Reactions">
                <field name="id"/>
                <field name="message_id"/>
                <field name="content"/>
                <field name="partner_id"/>
                <field name="guest_id"/>
            </tree>
        </field>
    </record>

    <record id="mail_message_reaction_action" model="ir.actions.act_window">
        <field name="name">Message Reactions</field>
        <field name="res_model">mail.message.reaction</field>
        <field name="view_mode">tree,form</field>
    </record>

</odoo>