project_project_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2018 Onestein
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->

<odoo>

    <record id="project_project_timeline" model="ir.ui.view">
        <field name="model">project.project</field>
        <field name="type">timeline</field>
        <field name="arch" type="xml">
            <timeline date_start="date_start"
                      date_stop="date"
                      default_group_by="partner_id"
                      event_open_popup="true"
            />
        </field>
    </record>

    <record id="project.open_view_project_all" model="ir.actions.act_window">
        <field name="view_mode">kanban,timeline,form</field>
    </record>

    <record id="project_project_form" model="ir.ui.view">
        <field name="name">project.project.form</field>
        <field name="model">project.project</field>
        <field name="inherit_id" ref="project.edit_project"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='resource_calendar_id']" position="after">
                <field name="date_start"/>
                <field name="date"/>
            </xpath>
        </field>
    </record>

</odoo>