Just found the solution
I’m sorry, I can’t really give away the name of the website but I can describe it :
It’s a page with 3 steps where the user enters his informations. On the page, there are elements like textboxes, dropdown lists, some images and two buttons : one “Next step” and one “Back” button. The elements of the 2nd and 3rd steps are hidden on page load. You have to hide every element of the latest step and show every element of the nest step each time you click on the Next Step button, which is really annoying if you have 10 elements/step. So I wanted to make it faster by grouping the elements.
So if you want to do that, you have to make every element visible, even the ones of the next steps, and you just have to hide the groups of the next steps on page load !
I hope it can help someone from the Bubble Community !