It would be nice to be able to see (and collapse) the layer you’re looking at.
In the picture, it would be nice to know which layer I’m in and (for example) toggle its visibility.
A model for how this could work can be seen at around 7:32 onwards in the video below in the context of code. In Vectornator, this could include artboards, layers, nested groups and possibly an option to edit guides.
Hope this provides some inspiration for the team!