Check the app installation: Ensure that the app you installed is compatible with your Odoo version and has been installed correctly. Verify that the app's dependencies are also installed.

Clear browser cache: Sometimes, the browser cache can cause display issues. Clear your browser cache and try reloading the page to see if the home menu appears.

Review app configuration: If the app you installed has any configuration settings related to the home menu, review the app's documentation or configuration options. Ensure that the configuration is properly set up to display the home menu.

Check for conflicting customizations: If you have made any customizations or installed additional modules that modify the home menu behavior, there may be a conflict causing the error. Temporarily disable any customizations or additional modules related to the home menu and see if the menu appears correctly.

Review the component code: If you have access to the codebase, review the 'HomeMenu' component code to ensure that the 'apps' property is defined correctly. Make sure it is assigned an array of app objects with the required properties (such as 'name', 'icon', 'sequence', etc.) for each app.

Restart Odoo server: In some cases, restarting the Odoo server can resolve display issues and allow the home menu to appear correctly. Restart your Odoo server and check if the home menu shows up after the restart.