I want to download only those videos that have subtitles (in the UK) or close captioning (in the US). How do I do that?

In video search I know I can click 'More search options' and get a 'Subtitles' entry box. Am I correct assuming that this 'subtitles' means words on the screen for any speech on the video and not alternative titles for the main title. If so what do I enter: Yes or Subtitles or what?

Does this enable me to search for 'subtitle' videos or is there some alternative method?

Failing any way of searching for subtitles is there a method of using filters to isolate subtitles from a search? Which leads me to ask a question about filters. I know that when a filter has several options you have to highlight the option you want, such as mp4 on the 'type' filter, to filter out the mp4's in the full search. But what about a filter that has only one option, do you have to select & highlight that filter before it is active? I ask this because there is a 'subtitle' filter with just one option.

I am sure that there are many folk out there who need subtitles to follow the plot, because of hearing or background noise problems. Please can someone give them a method of either searching or filtering to ensure that only 'subtitled' videos are downloaded.

Thanks