Hi, thanks to you for playing!
This is my first puzzle game, so I thought it would have bad design, but when I read your comment I started to notice it's obscure af hahha
Yeah the idea is that there are tree platforms that act as elevators used before by the old habitants to descent through the fog. I added a little hint on the top left classroom, where you can see a miniature of this. The panel is just a real time monitor of the availability and position of the elevators. Just go to the one that is enabled and unequip the antigravity armor.