Hi Diana, thanks for getting in contact!
I think what is confusing (understandably) is that your active layer is always automatically put on top. This is to make sure you are always able to see where and what you are drawing. And often drawings will be quite transparent normally consisting of fairly thin lines with lots of space between them. In your case it’s a completely opaque black, so it covers everything else when it is active.
I would suggest to just lower the opacity of the black layer to say about 50% while you work on your scene. You do that by clicking the small coloured field at the bottom of the layer column.
I hope this helps. Please let me know!