contract/contract_sale_generation/views/account_analytic_account_view.xml

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

    <record id="account_analytic_account_recurring_sale_form" model="ir.ui.view">
        <field name="name">account.analytic.account.invoice.recurring.sale.form</field>
        <field name="model">account.analytic.account</field>
        <field name="inherit_id" ref="contract.account_analytic_account_recurring_form_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='recurring_invoicing_type']" position="before">
                <field name="type"/>
                <field name="sale_autoconfirm"  attrs="{'invisible':[('type','!=', 'sale')]}" />
            </xpath>
             <xpath expr="//button[@name='recurring_create_invoice']" position="attributes">
                <attribute name="attrs">{'invisible': ['|',('recurring_invoices','!=',True),('type','!=','invoice')]}</attribute>
            </xpath> 
            <xpath expr="//button[@name='recurring_create_invoice']" position="before">
                <button name="recurring_create_sale"
                            type="object"
                            attrs="{'invisible': ['|',('recurring_invoices','!=',True),('type','!=','sale')]}"
                            string="Create sales"
                            class="oe_link"
                            groups="base.group_no_one"
                            />
            </xpath>
              <xpath expr="//button[@name='contract.act_recurring_invoices']" position="attributes">
                <attribute name="attrs">{'invisible': ['|',('recurring_invoices','!=',True),('type','!=','invoice')]}</attribute>
            </xpath>  
             <xpath expr="//button[@name='contract.act_recurring_invoices']" position="before">
                <button name="contract_sale_generation.act_recurring_sales"
                            type="action"
                            attrs="{'invisible': ['|',('recurring_invoices','!=',True),('type','!=','sale')]}"
                            string="⇒ Show recurring sales"
                            class="oe_link"
                            />
            </xpath> 
        </field>
    </record>

</odoo>