I recently found this website and subscribed because I find it very useful, I just have one question.

Most violin audios are accompanied by piano, is there any way of just having the violin without the piano(some beginner songs are violin-only, but very few)? Maybe I missed a button somewhere?

The midi files are available separately, you can request them if they're not there yet. The score of just the violin is available under the parts section for the piece.
Let me know if you need any more help