Windows 10: Why don't English subtitles work on non English scenes?

When streaming movies in Movies and TV, certain movies with multiple languages don't display subtitles for non-English dialogue. For example, in Kill Bill Vol. 1, none of the Japanese dialogue has subtitles. Considering the theatrical movie had subtitles for these scenes, it makes no sense why they were removed.

:)

 

Add into English subtitle to an MKV movie

Hi

i want to add an English subtitle to an MKV movie. Tried MKV toolnix & Handbrake.....from my research it says that they do not re encode, so only takes. Avery short time, but it took an hour or more.
am I doing something wrong, or is there an easier way without ever encoding the video. Maybe if I simply make sure the video and SRT file are the same name and the TV will simply allow the subtitle.

any help please ?
thanks

 

English (United States) for adding language is greyed.

The step where a list of optional languages are displayed.

The US English is presently not installed, and there is no other language except a base language which came with W10 22H2. Edit: So I just installed the US English. That is it. The US English is greyed because I took the first step of "Add Language" and forgot completing whole steps.

 

Windows 10 English updates to Spanish?

I've not done it but look in Settings, Time & Language, Language. [Only time I had to work on a non-English computer was to change the display screen on a Chinese Notebook their child had stepped on.]