odoo-pos-addons/pos_restaurant_table_booking/views/restaurant_table_booking.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="restaurant_table_booking_form" model="ir.ui.view">
    <field name="name">Booking restaurant.table_booking form</field>
    <field name="model">restaurant.table_booking</field>
    <field name="arch" type="xml">
      <form create="0" edit="0" delete="0">
        <sheet>
          <group>
            <group>
              <field name="booking_id" readonly="1"/>
              <field name="table_id" options="{'no_open':1, 'no_create':1}"/>
            </group>
            <group>
              <field name="datetime_start"/>
              <field name="datetime_stop"/>
              <field name="duration"/>
            </group>
          </group>
        </sheet>
      </form>
    </field>
  </record>

  <record id="restaurant_table_booking_tree" model="ir.ui.view">
    <field name="name">Booking restaurant.table_booking tree</field>
    <field name="model">restaurant.table_booking</field>
    <field name="arch" type="xml">
      <tree create="0" edit="0" delete="0">
        <field name="booking_id" options="{'no_create':1}"/>
        <field name="table_id" options="{'no_open':1, 'no_create':1}"/>
        <field name="datetime_start"/>
        <field name="datetime_stop"/>
        <field name="duration"/>
      </tree>
    </field>
  </record>

  <record id="restaurant_table_booking_gantt" model="ir.ui.view">
    <field name="name">Booking restaurant.table_booking gantt</field>
    <field name="model">restaurant.table_booking</field>
    <field name="arch" type="xml">
      <gantt string="Tables bookings" date_start="datetime_start" date_stop="datetime_stop" scales="day,week"
        default_scale="day" precision="{'day': 'hour:half', 'week': 'day:half'}" default_group_by="table_id" color="color"
        create="true" on_create="pos_restaurant_table_booking.create_new_booking_act_window" cell_create="true" edit="false">
        <field name="name"/>
        <field name="booking_id"/>
        <field name="duration"/>
        <field name="count"/>
        <templates>
          <div t-name="gantt-popover" class="container-fluid">
            <div class="row no-gutters">
              <div class="col">
                <ul class="pl-1 mb-0">
                  <li><strong>Start : </strong> <span t-esc="userTimezoneStartDate.format('YYYY-MM-DD hh:mm A')"/></li>
                  <li><strong>Stop : </strong> <span t-esc="userTimezoneStopDate.format('YYYY-MM-DD hh:mm A')"/></li>
                  <li><strong>Duration : </strong> <span t-field="record.duration" t-options="{'widget':'float_time'}"/> hours</li>
                  <li><strong>People count : </strong> <span t-field="record.count"/> pers.</li>
                </ul>
              </div>
            </div>
          </div>
        </templates>
      </gantt>
    </field>
  </record>

  <record id="restaurant_table_booking_search" model="ir.ui.view">
    <field name="name">Booking restaurant.table_booking search</field>
    <field name="model">restaurant.table_booking</field>
    <field name="arch" type="xml">
      <search>
        <field name="name"/>
        <field name="table_id"/>
        <field name="datetime_start"/>
      </search>
    </field>
  </record>

  <record id="restaurant_table_booking_act_window" model="ir.actions.act_window">
    <field name="name">Tables bookings</field>
    <field name="res_model">restaurant.table_booking</field>
    <field name="view_mode">gantt,form</field>
    <!-- <field name="context">{'search_default_today':1}</field> -->
    <!-- <field name="help" type="html">
      <p class="o_view_nocontent_smiling_face">
        Prendre une nouvelle réservation.
      </p><p>
        Une réservation compreend un nom, une date, des horaires et une ou plusieurs tables.
      </p>
    </field> -->
  </record>

  <menuitem
    id="restaurant_table_booking_menu"
    name="Tables bookings"
    parent="restaurant_booking_root_menu"
    action="restaurant_table_booking_act_window"
    sequence="20"
    groups="point_of_sale.group_pos_user"/>

</odoo>