Hello Frank,
Are you referring to having two monitors attached to your Mac, or to macOS 10.15+'s 'Split View' functionality?:
https://support.apple.com/en-gb/HT204948
If the latter, Hauptwerk doesn't have any dedicated support for that, and I haven't tried it myself (and can't test it here at the moment), but if macOS can maximise any window to the left of its split, and any other window to the right of its split then I would imagine that it would work with Hauptwerk by simply opening a second Hauptwerk console window in the normal way (via the View menu in Hauptwerk, with whatever virtual console display page tab you like selected on it) and putting that second console window on the right-hand side of the split, and the main console window on the left.