The left column navigation is confusing a lot of people at my company including myself sometimes. I am speaking about the lack of clear separation between pages and layers in the left column.
Most often developers aren’t realizing that the pages section can be scrolled or pulled down to increase visibility. If these two areas could be visually better differentiated from each other and help none designers to understand better keep track on which page they are located in.
It would improve collaboration and optimize their time finding the correct mocks to review and leave feedback or references to build.