At different spots in Nines, you will see three lines on top of each other next to items which means you can reorder these items by dragging them up or down. Currently, there are three such spots.
Reorder list items
On a list with items (including headings), you can quickly use the three lines next to the items to move them up or down.
Reorder photos
On any objects with profile photos (properties, zones, assets, etc), as soon as you more than, you can go into the Edit mode and quickly use the three lines next to the photos to move them up or down.
Reorder protocols
On protocols when you go into a Property that has Chapters, by clicking on the three dots with more options at the top, you can go into Reorder mode. In that mode all you can do is reorder, and you do this by using the three lines next to the chapters to move them up or down.