Cart Line settings are for confuguring Items in the cart. To manage cart line follow path as mentioned.
Twirll Login > Settings > Cart Line Settings
#1 : Click on Twirll logo on the top left of the page that will open up the options menu
#3 : Click on settings from the options menu
Locate “Cart line Settings” below the printer selection menu
#1 : Enabling “Cart Line Images” will start showing images of items in the cart
#2 : Enable “Cart Line Posting” if you want to notify kitchen about updates in cart.
#3 : Enable cart line comment if you wish to enter comments on cart line level or at each different item so this will get printed or notified along with updates in cart line items. also you can provide some quick text that can be added as a comment in the cart lines