Additional field in the product card

Good afternoon, tell me, I added another arbitrary form in the product card, if you do not use your theme and standard themes, then the field is displayed, but if I include the theme, there is nothing. tell me how to get it out? thank you.
add_action( ‘add_meta_boxes’, ‘genius_new_meta_box_single_prod’ );

function genius_new_meta_box_single_prod() {
add_meta_box(
‘custom_product_meta_box’,
‘Product third description’,
‘genius_add_custom_content_meta_box’,
‘product’,
‘normal’,
‘default’
);
}

Hello,

Navigate to Dashboard -> Layouts -> Cart and disable the layout, then recheck the Cart page.

https://prnt.sc/5ncP2Ai15ZP2

Kind Regards

[Author]

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