problem with slug home page

Hi,

i want put a slider in my front-page.php. This template is managing by a “Accueil” page in my back office.

my code is here :

/*Metaboxe slider*/
Container::make('post_meta', 'Slider Header')
    ->set_context('normal')
    ->set_priority('high')
    ->show_on_post_type('page')
    ->show_on_page('accueil')
    ->add_fields(array(
        Field::make('complex', 'crb_slider_header')->add_fields(array(
            Field::make('image', 'Image')->set_value_type('url')->help_text('Pour la bonne tenue du slider choisir une image aux dimensions suivantes : 1600px X 600px')
        ))
    ));

in my other project this code had run but now in my new project i can put the complex filed slider in my “accueil” page. in a “show_on_page” i must put a slug but for home page there is not slug. i try with this code :
->show_on_page(‘/’)

i try this code with a other slug page and this code works (for example for my page “architecture”)

but it did not work

have you got an idea for my problem ?

thanks so lot

https://wordpress.org/plugins/carbon-fields/