app-odoo/app_website_blog_superbar/views/ir_attachment_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="app_view_attachment_search" model="ir.ui.view">
            <field name="name">app.ir.attachment search</field>
            <field name="model">ir.attachment</field>
            <field name="inherit_id" ref="base.view_attachment_search"/>
            <field name="arch" type="xml">
                <xpath expr="//searchpanel//field[1]" position="before">
                    <field name="website_id"/>
                </xpath>
            </field>
        </record>

    </data>
</odoo>