Use case: I want to read the entire list of services. Currently, I have to select Category 1, scroll through the list, scroll back up and then select Category 2, and so on. It would be nicer if I did not have to scroll back up – either because the category selection is also visible below the list, or because it automatically jumps to the next category if I scroll over the end of a list.
Additionally, a button to expand all categories would be helpful.