stock-logistics-warehouse/stock_inventory/views/stock_quant.xml

<odoo>
    <record id="view_stock_quant_search_not_done" model="ir.ui.view">
            <field name="name">stock.quant.search.not.done</field>
            <field name="model">stock.quant</field>
            <field name="inherit_id" ref="stock.quant_search_view" />
            <field name="arch" type="xml">
                <filter name="to_apply" position="after">
                    <filter
                    name='to_do'
                    string="To Do"
                    domain="[('to_do', '=', 'True')]"
                />
                </filter>
            </field>
        </record>
</odoo>