odoo16/addons/website/views/ir_asset_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="asset_view_form_inherit_website" model="ir.ui.view">
        <field name="name">ir.asset.form.inherit.website</field>
        <field name="model">ir.asset</field>
        <field name="inherit_id" ref="base.asset_view_form"/>
        <field name="arch" type="xml">
            <field name="directive" position="after">
                <field name="website_id" options="{'no_create': True}" groups="website.group_multi_website"/>
            </field>
        </field>
    </record>
    <record id="asset_view_tree_inherit_website" model="ir.ui.view">
        <field name="name">ir.asset.tree.inherit.website</field>
        <field name="model">ir.asset</field>
        <field name="inherit_id" ref="base.asset_view_tree"/>
        <field name="arch" type="xml">
            <field name="bundle" position="after">
                <field name="website_id" groups="website.group_multi_website"/>
            </field>
        </field>
    </record>
</odoo>