I have a couple of PDFs (some of which are 500+ pages long). In these PDFs I made a lot of highlights, when I read through them. I came up with a colouring system, such that each colour is associated with a particular theme. Now I would like to focus on one theme/colour. I.e. quickly jump through, say the Pink highlights. However Preview.app, in its 'Highlights & Notes' panel, only shows colour for notes. I am not able to see which colour I used on the highlights.
Can I somehow get an overview of the highlights and their highlight colour? Perhaps in a different program (Skim)?