With iPadOS and the new iPad’s USB-C-connectors more people will start to think of iPad’s as their primary device and replace a MacBook with it. As a result, more and more people will be using an external monitor alongside the internal screen. Some apps already make use of this and allow a properly scaled second window instead of a mirrored screen to display here. It would be great if MarginNotes could add this as well.
Use cases: Display either the document or the Mindmap here to allow for more space for editing on the iPad.
Another Use could be having a note-taking app sich as Goodnotes on the primary screen; MarginNote as a small window in Multi-tasking just to have the full app run on the external monitor. With mouse-input it’s no problem to work on this screen.