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Since Revit 2019 is now an "Obsolete Version" in the eyes of Autodesk:
If you are migrating from 2018 to 2019, remember that your plugins must be updated. Most developers have stopped supporting 2019, so keep a backup of your current installers. Search results for revit 2019 (19)
The first version to allow you to drag views out of the main window onto a second screen. Since Revit 2019 is now an "Obsolete Version"