Those are in template files

- resources/views/front/default/partials/top_menu.blade.php
- resources/views/front/default/partials/footer.blade.php


If you want to remove the description and thumbnail above the main element section, see screenshot...

https://ibb.co/9YD6TtS
Then, you need to remove the framed code shown in the image below from “resources\views\front\default\product.blade.php”
https://ibb.co/z7qb941