After activating all of the plugins and import demo data, if WooCommerce pages go to double you need to delete duplicate pages and set shop pages to the primary menu manually. If the pages do not go to double then you only set up the WooCommerce pages to the menu.
Please follow the below process.
2. Please delete the marked four Cart, Checkout, My account and Shop pages following the screenshot
After deleting the pages you need to set the pages into theme primary menu. Go to your dashboard Appearance -> Menus
Please remove all marked pages from your primary menu
Then add the WooCommerce Pages to the Menu
Then drag and drop the pages under Shop
Hit the Save Menu button.