NGG Smart Image Search provides smart search and display functionalities for images in NextGEN galleries. It requires NextGEN Gallery to be installed and activated.

Version 4 is a highly recommended functional and security update. It is a complete revision introducing Gutenberg blocks, new display modes, improved documentation and many optimizations. Previous documentation pages remain valid unless updated.

More information and examples:
Homepage for Plugin NGG Smart Image Search

Searches can be performed across title, description, filename and tags. Two search modes are available: basic (OR) and extended (AND).

Search results can be displayed in various layouts:

linked image lists with meta data
advanced thumbnail lists
advanced mosaic layouts
single image inspection
fancybox v6 lightbox with EXIF display
paging, sorting, limiting
native NextGEN / Pro / Plus galleries

Search input can be provided via:

Gutenberg block
URL parameter
legacy shortcode
legacy widget

Extended documentation:
https://r-fotos.de/wordpress-plugins/nextgen-galleries-smart-image-search/new-functionalities-v4/