To replace the old “london” gallery with “london231120,” update the content of the relevant page or post with the new gallery shortcode or Elementor widget. Check theme settings for gallery options, clear caches, and verify the new gallery’s visibility settings. Look for custom code pointing to the old gallery and inspect the database for any lingering references. Ensure there are no conflicts with plugins. If issues persist, seek help from theme or gallery plugin support forums.
Check GIf of this issue here: https://frasidibuoncompleanno.com/
Thanks for your advice.
I found the trick,
After adding a new Gallery on the page, I have to clicking [Update] to take effect.