stock-logistics-warehouse/stock_quant_manual_assign/views/stock_move_view.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record model="ir.ui.view" id="stock_picking_manual_quants_form_view">
        <field name="name">stock.picking.form</field>
        <field name="model">stock.picking</field>
        <field name="inherit_id" ref="stock.view_picking_form" />
        <field name="arch" type="xml">
            <button name="action_show_details" position="before">
                <button
                    name="%(assign_manual_quants_action)d"
                    type="action"
                    icon="fa-tags"
                    title="Manual Quants"
                    options='{"warn": true}'
                    attrs="{'invisible':['|',('picking_code','=','incoming'),('state','not in',('confirmed','assigned','partially_available'))]}"
                />
            </button>
        </field>
    </record>
</odoo>