This Seeking Tech guide will explain how you can complete the seesaw mini-game found in the Verso’s Drafts area of Clair Obscur: Expedition 33.
To get the timing right, press the jump button just before the gestral lands on his side of the seesaw. Once you figure out when to jump, then you should be able to easily complete the mini-game.
You can find a video of the seesaw location and mini-game completion below: