This line is confusing. I guess English is not your native language. I guess you mean they do not appear in the video. By default subtitles are embedded in the export file and the media player lets the viewer choose whether to see the subtitles. This is the way that 99.999% of videos before 2020 were made–for the hearing impaired or different languages. But since around 2017 people feel the need to put their text into the actual video imagery and impose that decision and its choice of language on all viewers. I think it had to do with the rise of watching social media videos on smart phones with the volume turned off.