Hello. I have seen this feature being requested for many years, and the iPadOS developer docs suggest that it is a relatively easy ticket to fill. I would like to be able to connect my iPad to an external monitor, and extend MarginNote to display my mindmap (or cards) on the monitor, while keeping the doc open for full-screen viewing and annotating on the iPad. This would be very similar to the multi-window or split mode, but would be an ergonomic miracle. Without this feature, the apps feels incomplete to me in regard to workflow support.
Is there a roadmap for this? It has been asked for since 2018-2019, and many apps now support an external display, rather than simply mirroring (i.e. Notability).