@anon-dc
What you can select depends on what is provided by the video you are watching.
For example, this video only has Japanese and Portuguese subtitles, so I can only select those.
https://www.youtube.com/watch?v=wZySfwnh5eA&list=PLcm5I05IhDpZ498c_knWUqznpVUUyvgu1&index=5&t=9s
If there is a specific video that has for example English subtitles, but you cant select them, then please link it so we can take a look.
A