Currently, when you open a Deal and navigate to "view all properties", you'll see the property groups in the center panel of the UI. Each property group, of course, can be expanded to reveal the properties that are contained within.
The problem is that these property groups can't be rearranged in any manner. They are arranged by order of creation, and there's no way to change that. This makes it difficult for users who are dealing with a lot of groups, who need to put the most important ones at the top. Furthermore, you can't rearrange the other of the properties within each group, either.
This would be a huge timesaver, if users could have the option to rearrange the order of their properties and property groups so that the most important ones can be surfaced to the top.