Small Update: I found out how to hide columns in the "Prepare" section, so I can just hide the columns I don't want, to make it more clear and structured.
However, I still don't know how to hide dimensions. If I'm in the "Prepare" section and click on a dimension, I can "hide from dataset panel". But it doesn't seem to work; the dimension continues to show up under dimensions!
If I cannot delete the original dimensions, maybe I can at least hide them! If you know how, please let me know!
Thanks!!
Alex