By default Odoo is showing always at least 4 rows with the tree view. As described in this topic:
\https://stackoverflow.com/questions/46468472/tree-view-showing-extra-empty-fields

​I would like to decrease this value to one or two rows. But my custom module changes nothing.

I have this js file odoo\addons\custom_theme\static\src\js\views\list\list_renderer.js:

odoo.define('custom_theme.custom_table_rows', function (require){
    "use strict";
  
    //require the module to modify:
    var ListRenderer = require(website_sale_delivery.ListRenderer);
  
    //override the method:
    ListRenderer.include({
        _renderBody: function () {
            var $rows = this._renderRows();
            while ($rows.length < 1) {
                $rows.push(this._renderEmptyRow());
            }
            return $('<tbody>').append($rows);
        }
      });
  });

And I called it inside xml odoo\addons\custom_theme\views\header.xml:

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
	<template id="assets_backend" name="Custom_header_theme" inherit_id="web.assets_backend">
		<xpath expr=".">
		    <script type="text/javascript" src="/custom_theme/static/src/js/views/list/list_renderer.js"></script>
        	</xpath>
	</template>
    </data>
</odoo>

Also xml file called inside manifest:

'data': [
        # 'security/ir.model.access.csv',
        'views/views.xml',
        'views/templates.xml',
        'views/header.xml',
    ],

And it does nothing. When I instead modify the js file directly inside source code ("odoo/addons/web/static/src/js/views/list/list_renderer.js") it is working and less rows are appearing. Module as a whole is working because it performs other modifications.

What is wrong?