a2_stock.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record id="a2_stock_quant_category" model="ir.ui.view">
        <field name="name">a2.stock.quant.category</field>
	<field name="model">stock.quant</field>
	<field name="inherit_id" ref="stock.view_stock_quant_tree_inventory_editable"></field>
	<field name="arch" type="xml">
		<field name="user_id" position="after">
			<field name="category_id" optional="hide" />
		</field>
        </field>
    </record>

</odoo>