As jAlbum generates offline albums, it's not possible to change any settings after an album has been generated.
The jAlbum Bridge WordPress plugin is importing a few images into a WP post to showcase the real album. This plugin also works using shortcodes if the Plugin is installed:
https://www.your-site-here.com/short-code-reference/
We have a new skin, called "Embed", which can be fully embedded into any web page, and has a beta version plugin for the Block Editor:
https://jalbum.net/forum/thread.jspa?threadID=61083&tstart=0