Can I select all subtitle language checkboxes at once to search across every language?

Leave the language filters empty to search without a subtitle-language restriction.

In Metadata search, selecting several Manual Subs languages requires a video to have subtitles in all of them. The selections are combined with AND, rather than matching any one of the chosen languages. Selecting every language would therefore return very few videos, rather than search all languages freely.

If you want results for several specific languages independently, run a separate search for each one.