With Line-Up you have control over what external booking fee is shown and charged to your customers.
When creating a ticket, underneath the ticket price field is a booking fee option where you can set an external booking fee which is displayed in brackets externally to the ticket price. You can set this fee at any amount you like.
The table to the right of the price and booking fee fields will display what the Line-Up fee is based on the ticket price and the booking fee you have entered. It also displays what your customer will pay in total, and for you any fee tax that will be charged and the net amount you will make after the Line-Up fee and fee tax (but excluding Stripe payment processing fees).
If you do not want your tickets to have an external fee then simply set the booking fee field to 0
Please note: When setting your ticket price and booking fee, please consider that the calculation table shows the estimated Line-Up fee and does not display Stripe payment processing fee so the Net amount shown excludes that charge.