Create and organize archive themes

Themes are the top tier of the collection. Each theme holds its own categories and sets whether a photo takes one category or several.

Each theme carries a single setting. It decides whether a photo can be filed under one category or under several at once.

The category table allows only one checkbox to be selected, so each photo sits in exactly one category of that theme.

Several checkboxes may be selected at once, letting a photo belong to more than one category within the theme.

Every active theme appears with its assignment rule and the number of categories it contains, giving a clear view of how the archive is structured.