I agree with this suggestion. Here is my use case: when I open a scientific article to read and annotate, I often want to use a separate window so that I can look up bibliographic references or look at a figure on a separate page to the text that describes it. At the moment, when I click on the split-view icon in the titlebar, there are two options: "Open in New Window" and "Close Other Tabs". When I click on the first option, it changes the document in the original window. This is annoying. One solution would be to add a new option "Duplicate in New Window". Could you please consider this?