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can someone explain how I did this, what it is used for? I have no idea how it happened. and if I send the file, does it send as two files?
You opened a Window > New Window for this file and saved it.
Which can be usefull; one window zoomed in to edit a detail., the other zoomed out for an overview.
If you close one and save the file, you will have one window when you open it the next time.