app_odoo_customize/static/src/xml/customize_user_menu.xml
<?xml version="1.0" encoding="UTF-8"?>
<templates xml:space="preserve">
<t t-extend="UserMenu">
<t t-jquery=".dropdown-menu" t-operation="prepend">
<switch-lang/>
<li t-if="widget.session.debug != true">
<a href="#" data-menu="debug">Activate the developer mode</a>
</li>
<li t-if="widget.session.debug != 'assets'">
<a href="#" data-menu="debugassets">Activate the developer mode (with assets)</a>
</li>
<li t-if="widget.session.debug != false">
<a href="#" data-menu="quitdebug">Deactivate the developer mode</a>
</li>
<li>
<a href="#" data-menu="documentation_dev">Developer Manual</a>
</li>
<li class="divider"/>
</t>
</t>
</templates>