partner-contact/partner_multi_relation_tabs/views/res_partner_tab.xml

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

        <record id="tree_res_partner_tab" model="ir.ui.view">
            <field name="model">res.partner.tab</field>
            <field type="xml" name="arch">
                <tree>
                    <field name="code" />
                    <field name="name" />
                </tree>
            </field>
        </record>

        <record id="form_res_partner_tab" model="ir.ui.view">
            <field name="model">res.partner.tab</field>
            <field type="xml" name="arch">
                <form>
                    <group colspan="6" col="4">
                        <group
                            id="tab_group_general" string="General"
                            colspan="2" col="2"
                            >
                            <field name="code" />
                            <field name="name" />
                        </group>
                        <group
                            id="tab_group_target"
                            string="Select partner type and category for tab"
                            colspan="2" col="2"
                            >
                            <field name="contact_type" />
                            <field name="partner_category_id" />
                        </group>
                        <separator
                            colspan="2"
                            string="Select specific partners to have this tab"
                            />
                        <field name="partner_ids" colspan="2" nolabel="1"/>
                    </group>
                </form>
            </field>
        </record>

</odoo>