If you are referring to the space between the page footer and the browser frame being larger on the Home page, this is due to the Portrait Widget bounding area.
You see, this is a two row widget which you have changed to a single row by changing the column count to 6. As there are only 6 images, the widget changes to one row and adjusts the thumbnail sizes to accommodate the width of the widget bounding area thus causing the height problem you note.
Unfortunately, the widget does not adjust to reduce the bounding height which results in empty space below it.
You can easily see this by;
[a] removing the widget and re-exporting the page and seeing the issue resolved
[b] increase the height of the home page then select the widget in your design and pressing a colour swatch to reveal it's full bounding area or
[c] In multipage view, select the widget on the home page to reveal the [
Widget: Edit [X] ] control which appears part way down the next page in the designer view.
This would likely be a bug in the widget.
EDIT: You posted while I was inspecting and writing. Hope the above helps.
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