To make a gallery, simply draw a table on your page and apply the Action to it. The table describes the layout and size of each thumbnail (which will include any frames created by the Themes). In the example to the left, the cyan area shows the maximum size of the thumbnail, which will be scaled proportionally to fit inside that area.
You then apply the Action to the table. This gives you a visual representation of the gallery's layout in Freeway. Do not put any content within the table itself.