Media Optimisation query - subtitle generation

HI,
I’ve noticed when I’ve been optimising my media down from 1080p to 720p 2Mbps, it is generating many ‘Subrip Subtitle File’s’ - is there any way for it to only generate the English subtitles and not the other languages?

Secondly, if it is a movie that has foreign talk in the movie and there is on-purpose subtitles - I assume these will still be in the movie? These files are just being generated in the case that you want to have subtitles and not listen to it - is that the case?

Thanks