You can now open multiple Director windows.
Open a new Director window
Ctrl+Clickon an item in the left side menu
Via the Window menu > File > New Window
A new Director window is opened in the same size as the previous one.
Close a Director window
Click the Close button (x in the top right corner of the window)
Click "Close window"
Click the Close button in the window preview of the task bar
Closing the original Director window (left most preview window on the taskbar) would close Pixotope (all Director windows).