Admiror Gallery is free extension for Joomla! based websites. Admiror Gallery is all in one, a simple and instant solution for rendering image gallery from folder with images, but very flexible and adaptable.
I figured it out myself: the article format depends not on the main Control Panel but on the Plugin configuration...
When I menu-link to a gallery, the listed-2col. template comes out as it should. If I use the exact same settings in the main Control Panel and embed my gallery in an article (in order to faciliate printing), the template is not respected in 2 columns. Thanks for whatever suggestions.
ps - I really like Admiror for my clients because they can load photos easily as folders, do language-context descriptions, and easily use the Control Panel. Thanks!
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Joomla! is a free and open source content management system (CMS) for publishing content on the World Wide Web and intranets. With a vibrant volunteer community, user-friendly features and plenty of power, Joomla is perfect for your website!
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It would be very hard for me to figure this out without the access to your site 
