[KevinH]

One question:

if LibreOffice or Scrivener app is completely shutdown (not open and operating in the background) does this feature still work? If so, it is a operating system feature keeping track of what files you used recently not an application feature that keeps track of recent files it loaded.

That macOS feature would not be part of Qt cross-platform support as Qt does not use macOS os system calls to load files so tracking by the OS would not be done.

However if this open recent file feature only works once the program has been initially launched by the user when it shows up in the active part of the dock, then it is an application based feature and that we may be able to recreate.

Unless there is a hidden macOS way to register files an App opens after the fact so they are somehow available to the OS when the actual application is not running.

Either way this feature would not be cross platform at all.