Desktop App Update in December lost option to manual rearrangement user contacts in HUD. Please bring it back.
Please enable the new app layout under Settings - General - New App Layout and you'll be able to rearrange contacts when the HUD is pinned in app or popped out.
You can also make the HUD a standalone tab on the app by navigating to Settings - Customize tabs - Phone - deselecting HUD. This will remove HUD from being under the phone tab to its own tab.