the filter is reflected only in the URL via the URL parameter list_id=4373176. there is no indicator on the webpage otherwise that this filter is applied.
here’s more information on applying parameters in the URL for the Explore page: https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki-part-1-of-2/63, and this section talks specifically about filtering by lists: https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki/63#heading--multiple--taxa--list.