It's difficult understanding exactly what it is you are trying to accomplish here. The 3 dots are for "more" actions because there isn't room to display them all. The "Download" option is because the song you have selected is "online" and not local to your device.
Please sign up for an account, return to this thread, and let us know what you are trying to accomplish or what it is you are wanting Groove to do with a song, so that we can provide some specific instructions.