If a series is featured, the featured tag is next to the add series part button. I think it should be moved to series information in the sidebar if the sidebar is enabled, like how it is done in articles.
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No its not. The "Add Series Part" button is PLACED via the xenforo template tag xen:topctrl and the location for that is located to the RIGHT of the Breadcrumb (as shown in the image below).the featured tag is next to the add series part button.
<xen:if is="{$canManageSeries} && {$canAddSeriesPart}">
<xen:topctrl><a href="{xen:link 'ams/series/add-part', $series}" class="callToAction"><span>{xen:phrase nflj_ams_add_series_part}</span></a></xen:topctrl>
</xen:if>