Hi,
Did you activate “Enable Back-To-Top Button” from theme options->Layout.
Make sure activate footer on page options:
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Edit the frontpage,
Click “BM Content Builder”
Click “Settings”, you’ll see the page options:

Click “Show Footer” as on
Click “x” to close BM Content Builder panel
Click “update”.

refer: https://seatheme.net/documentation/art/index.html#bm-builder
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