Where is the first-class seat adjustment button located?

[AdalynnLee]

The adjustment button for the window-side first-class seat is the black button on the left-hand side, while the adjustment button for the aisle seat is the black button on the outer side. To adjust the seat, press the black button and lean back firmly to change the seat angle, then release the button to lock it in place. To return the seat to its original position, hold the button without leaning back, and the backrest will automatically reset. Additional information: Below is an introduction to first-class seats: 1. Board the train with your ticket and relevant documents, pass through security, proceed to the first-class carriage, and locate your assigned seat. 2. First, understand that the difference between first-class and second-class seats lies not in the seats themselves but in the spatial arrangement. First-class adopts a 2+2 configuration while second-class uses 3+2, making first-class aisles wider than second-class, creating a more spacious and comfortable feeling. Additionally, first-class provides passengers with footrests, demonstrating thoughtful design. 3. Both first-class and second-class seats can be rotated, allowing passengers to sit facing each other.