partner-contact/partner_label/views/base_config_settings.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <record id="view_general_configuration" model="ir.ui.view">
        <field name="model">base.config.settings</field>
        <field name="inherit_id" ref="base_setup.view_general_configuration" />
        <field name="arch" type="xml">
            <group name="report" position="after">
                <group name="partner_labels" string="Labels configuration">
                    <label for="partner_labels_width" />
                    <div><field name="partner_labels_width" class="oe_inline" /> mm</div>
                    <label for="partner_labels_height" />
                    <div><field name="partner_labels_height" class="oe_inline" /> mm</div>
                    <label string="Margin"/>
                    <div class="oe_inline">
                        Top: <field name="partner_labels_margin_top" string="Top" class="oe_inline"/>mm,
                        Bottom: <field name="partner_labels_margin_bottom" string="Bottom" class="oe_inline"/>mm,
                        Left: <field name="partner_labels_margin_left" string="Left" class="oe_inline"/>mm,
                        Right: <field name="partner_labels_margin_right" string="Right" class="oe_inline"/>mm
                    </div>
                    <label for="partner_labels_padding" />
                    <div><field name="partner_labels_padding" class="oe_inline" /> mm</div>
                    <label for="partner_labels_paperformat_id" />
                    <div>
                        <field name="partner_labels_paperformat_id" class="oe_inline" />
                        <button type="object" name="action_partner_labels_preview" string="Preview" />
                    </div>
                </group>
            </group>
        </field>
    </record>
</odoo>