Odoo-Build/snippets/web.assets_common.set_form_width.xml

<data inherit_id="web.assets_common" priority="50">
    <xpath expr="." position="inside">
        <style>
          @media (min-width: 992px) {
          .o_form_view .o_form_sheet_bg &gt; .o_form_sheet {
               max-width: 1450px !important;
            }
          }
    </style>
    </xpath>
</data>