With 'Show on Store Front', you can decide to make the products you import through Linksis visible or invincible. This means you can choose whether to make your imported products show on your Shopify store front or not.
To make imported products invincible in your store, Go to menu > Click on Default Values > Click Show on Store Front > Select Hide.
Please note when you choose to hide products from your store front, previously imported products will not be hidden. You can hide previously imported product through Shopify.