Odoo-Build/snippets/mint_system.knowledge.knowledge_article_view_form.style_max_width.xml

<data priority="50">
    <xpath expr="//div[hasclass('o_knowledge_body')]" position="before">
        <style>
            .odoo-editor-editable {
              max-width: 100% !important;
            }
        </style>
    </xpath>
</data>