Ninaa321 – https://airlines-office.com/blog/lufthansa-airlines-seat-selection/

You can choose your seat when you book a ticket with Lufthansa, which might improve your experience considerably. On Lufthansa, you can choose your seat during the booking process or at a later time via their mobile app or website. The type of tariff you have selected may affect the availability of seat selection options. Depending on your Miles & More status and the fare class, you may be able to choose your seat in Economy Class for free or at a cost. Lufthansa will assign you a seat at check-in if you don’t choose one in advance; this service may or may not come with an additional fee.