The auto index has a number of options for layout, and within those options a number of permutations. Below, a high-altitude overview of available layouts, termed “Gallery Index Styles”. The layout may be worked on from within the Appearance control pane of either TTG CE3 Auto Index or TTG CE3 Pages:
The default Gallery Index Style is “Descriptive”. It is also the most informative, containing Album Title, Description and Thumbnail, and the easiest to deploy because it has no specific requirements for the size or orientation of thumbnails. It just works.
The “Iconic” layout allows for custom shapes and large, impactful thumbnails. To get those thumbnails, though, users often will need to create them separate from Lightroom and upload them manually for use by the index. It's extra work, but a small price to pay for the aesthetic gain. Read up on using custom thumbnails for more information.
Using the “Iconic” layout, it's possible to create layouts using squares, oblong rectangles, or even circles.
The “Iconic, Captioned” layout is simliar to the “Iconic” layout, except that Album Titles and Descriptions appear below the icons, rather than in an overlay.
The “Masonry” style layout is about as easy to use as the “Descriptive” layout, as thumbnails mostly take care of themselves (i.e. there is generally no need to supply custom thumbnails). The “Masonry” layout is particular well-suited to websites also using the masonry-style layout for image galleries.
The “Text-only” layout is similar to the “Descriptive” layout, except that it does not use thumbnail images. This makes it suitable for a page of links, or when thumbnails may be of a sensitive nature (for example, if indexing a group of password protected galleries of nudes, etc. where thumbnails may be compromising).