design-themes/test_themes/static/src/js/navbar.js

odoo.define('test_themes.website_selector', function (require) {
'use strict';

const websiteNavbarData = require('website.navbar');
const { registry } = require("@web/core/registry");

const TestThemesWebsiteSelector = websiteNavbarData.WebsiteNavbarActionWidget.extend({
    /**
     * @override
     */
    start: function () {
        this.$('.js_multi_website_switch[data-toggle]').tooltip({
            html: true,
            placement: 'left',
            delay: {show: 100, hide: 0},
        });
        return this._super(...arguments);
    },

});

registry.category("website_navbar_widgets").add("TestThemesWebsiteSelector", {
    Widget: TestThemesWebsiteSelector,
    selector: '#website_switcher',
});

return {
    TestThemesWebsiteSelector: TestThemesWebsiteSelector,
};
});