Unfortunately, it does not appear to have English subtitles on this site according to the icons (I cannot create an account to check at the moment). It does look like you can rent the film with subtitles quite cheaply from Amazon: https://www.amazon.com/Blind-Chance-English-Subtitled-Bogusl...
> All film materials presented on the 35mm.online platform meet the requirements of WCAG 2.0 - they have audio descriptions, transcriptions, subtitles in Polish and English, as well as comprehensive descriptions. For foreigners, the entire film library of the Platform is available in English.
So I assume that this one also has English subtitles. The icon below the film is only about the available audio language options.
Edit: Just double checked and yes, the English subtitles are available for this one (and all other films).