Hey @nicolas.daprigny for that one you would just need to add a hiding rule. So since the Button is inside a Group, you would click on that Group and select “Add Hiding Rule”:
Here, Bubble is automatically calculating the parent width (the larger Grey Group which holds all of these elements). That group’s width is currently 817 pixels in this example. So with that hiding rule, the small right group with the button will become hidden when the parent (Grey Group) width is 817 pixels or less.
Since the text element on the left is not set to fixed-width, and it has no max-width, its width will increase to the width of the Grey Group, once the small right group is hidden.