project_task_views.xml

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

        <record id="view_task_tree2" model="ir.ui.view">
            <field name="name">project.task.tree.inherit</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.view_task_tree2" />
            <field name="arch" type="xml">
                <field name="date_deadline" position="after">
                    <field name="duree_hr" sum="Durée" />
                </field>
            </field>
        </record>

        <record id="view_task_form2" model="ir.ui.view">
            <field name="name">view.task.form2.form.inherit</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.view_task_form2" />
            <field name="arch" type="xml">
                <xpath expr="//notebook" position="before">
                    <group>
                        <field name="participant_ids" widget="one2many">
                            <tree
                                string="Participants"
                                editable="top"
                                default_order='porteur_id'
                            >
                                <field name="porteur_id" />
                                <field name="lastname" />
                                <field name="firstname" />
                                <field name="commune" />
                                <field name="mobile" />
                                <field name="fixe" />
                                <field name="email" widget="email" />
                                <field name="h_theoriques" />
                                <field name="h_pratiques" />
                                <field name="eligible" />
                            </tree>
                        </field>
                    </group>
                </xpath>
                <xpath expr="//field[@name='user_id']" position="after">
                    <field name="formateur_id" />
                </xpath>
                <xpath expr="//field[@name='date_deadline']" position="after">
                    <field name="date_account" />
                    <field name="duree_jr" />
                    <field name="cout_seance" />
                    <field name="subtask_project_id" invisible="1" />
                    <field name="parent_id" invisible="1" />
                    <field name="partner_id" invisible="1" />
                </xpath>
                <xpath
                    expr="//notebook/page[@name='description_page']"
                    position="attributes"
                >
                    <attribute name="invisible">1</attribute>
                </xpath>
                <xpath expr="//notebook/page[@name='extra_info']" position="attributes">
                    <attribute name="invisible">1</attribute>
                </xpath>
            </field>
        </record>

        <record id="quick_create_task_form" model="ir.ui.view">
            <field name="name">project.task.form.quick_create.inherit</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.quick_create_task_form" />
            <field name="arch" type="xml">
                <field name="user_id" position="replace">
                    <field name="date_deadline" />
                </field>
            </field>
        </record>

        <record model="ir.ui.view" id="view_task_kanban">
            <field name="name">project.task.kanban</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.view_task_kanban" />
            <field name="arch" type="xml">
                <kanban position="attributes">
                    <attribute name="default_order">date_deadline asc</attribute>
                </kanban>
                <field name="user_id" position="after">
                    <field name="cout_seance" />
                </field>
                <xpath
                    expr="//templates//div[@class='o_kanban_record_headings']//small"
                    position="inside"
                >
                    <br />
                    <t t-if="record.cout_seance.raw_value">
                        <span>Coût de la séance: </span><field name="cout_seance" /> €
                    </t>
                </xpath>

            </field>
        </record>

    </data>
</odoo>