Collapse option

There is the Drupal 7 module https://www.drupal.org/project/facetapi_collapsible → .

Perhaps it can be ported to Drupal 10, or integrated directly into the Facet module?

I tried Collapsiblock → , and it works pretty well, thanks @p4trizio!

The only thing I would like, would be for a "Disallow collapsing, if facet is in use"-option -- or "Indicate if facet is in use", but it's not that critical.

It actually looks like the "Disallow collapsing, if facet is in use"-feature is already there, but instead as a "Always show active facet", which also works well:

1. Enable a facet in a few blocks
2. Collapse all blocks
3. Reload, and see that the blocks with an active facet get automatically expanded

Pretty cool.