“Umh, why would you not want the whole sentence? Why even have the option to decrease the amount of information you’re seeing?”
Because it makes it easier for me to learn just one word at a time per sentence. Easier for a beginner, more relaxing when watching videos to just see one or two new words at a time.
Ex: while watching a video in English, I turn on subtitles to translate from English to Language X (the one I’m learning). And then instead of seeing the whole sentence in language X and being overwhelmed as a beginner, just seeing one or two main words (in English, in language X, and the pronunciation/Romanization/pinyin etc for the word in language X)