Hey Louisa,
The double scrollbar issue happens if the height of the content of a bar is taller than the height of the bar. This usually happens in the footer builder because the bar’s height is fixed. Right now, your footer bar’s height is 5px.
The solution: Set all your Footer Bar’s Height to auto
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Another thing that could cause the double scrollbar issue is if an element has negative bottom margin so you will want to be careful when applying negative bottom margins as that affects the height of a header or footer bar or content section.
Hope that helps.