Is this related to a third party style?
In the default style the side nav is always on the left.
Well, it's not 3rd party, I can tell you that.Your what's new page is not standard.
This is the default.: https://xenforo.com/community/whats-new/
admin.php?widgets/
Have you looked at the admin cp page for widgets?admin.php?widgets/
There you can configure each widget's position.
There is no widget "sidebar" (right) option for the What's New page.
And there's no widget "sidenav" (left) option for the Forums List page.
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