<div>The <a href="&base_url&admin/settings/node_gallery/settings">global settings page</a> is self-documented.  The only point
that might not be obvious is that these settings impact all relationships (hence global).  Here's a screenshot:</div>
<br/>
<div align="center"><img src="&path&images/global-settings.png" alt="Screenshot showing the global settings" /></div>