https://wccftech.com/how-to/vampire-the-masquerade-swansong-scene-4-how-to-activate-the-elevator-with-emem/

During Scene 4 of Vampire: The Masquerade - Swansong, Emem will be sent to the old Jefferson Library by Prince Hazel Iversen, in order to meet with Deneb Osborne. However, she will find herself locked in a magical prison and need to find a way to escape. This area is full of mysteries and puzzles to resolve and requires a lot of exploration. This area also features an ancient elevator, that can only be activated using the right combination.

You will need to use your Disciplines to reach the area in which the elevator is located. It is on the same level as the starting area of the mission, just some stairs higher. However, to access it you need to go down from your cell first and use your Blink ability to reach the proper access to the elevator, placed inside a high round tower.