Creating a different menu for the blog posts only

Hi there,

Yes, it’s possible with some PHP and CSS code. But do you mean blog page or single posts? The code below is written for the single posts.

1. Create a new menu at Appearance > Menus.

2. Add this PHP code:

add_filter( 'wp_nav_menu_args', function ( $args ) {
    // if the menu is the primary menu && is a single post
    if ( 'primary' === $args['theme_location'] && is_single()  ) {
            $args['menu'] = 'My second menu'; //change it to the actual menu name
    }
    return $args;
} );

Adding PHP: https://docs.generatepress.com/article/adding-php/

Once the menu is implemented, let me know what kind of style you are looking for for the menu.

Hi there,

If you also want to set a specific menu for the blog page, replace the snippet with this one:

add_filter( 'wp_nav_menu_args', function ( $args ) {
    // if the menu is the primary menu
    if ( 'primary' === $args['theme_location'] ) {
        
        // Different menu for single posts
        if ( is_single() ) {
            $args['menu'] = 'My second menu'; // Menu for single posts
        }
        
        // Different menu for blog page
        if ( is_home() ) {
            $args['menu'] = 'Blog menu'; // Menu for blog page - change to your actual menu name
        }
    }
    return $args;
} );

So, where do I insert this code, please?

You can use one of the methods mentioned in this article:
Adding PHP: https://docs.generatepress.com/article/adding-php/

And how can I style the different menus?

Can you clarify what specific styles you’d like to apply?