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In the Loop page builder I cannot change the positioning of the sidebars (the layout).

You can fix by editing functions/theme.php and locating line 2618 which should look like this:

$shortcode .= ']';

Add the following line of code right above it so it looks like so:

$shortcode .= !empty($layout) ? ' layout="' . $layout . '"' : '';<br>$shortcode .= ']';
<br>