MacOS has a setting in System Preferences->Dock for the action to take on double-clicking in a window's title bar. The Cocoa UI Finale versions (2014+) ignore this setting and do nothing when you doubleclick the title bar.
This is a big regression from Fin12 and earlier. It means that the only option for zooming a window requires two hands. (This is because the idiots at Apple decided to change the zoom button to a full-screen button starting in I believe 10.10.) That makes it inconvenient for me and impossible (or extremely difficult) for someone with less than two hands. Plus since all other windows in other apps behave according to the setting, it is hard to remember to option-click in Finale and Finale alone.