![enter image description here][1]
Обратите внимание, что в редакторе печатных плат зеркальное отображение невозможно.
Можно только повернуть и поменять местами верхний и нижний слои.
Note that in the PCB editor, it is not possible to mirror.
It is only possible to rotate and to swap between top and bottom layers.
[1]: /editor/20170502/5908a0fb4422a.png
Извините, но я не могу воспроизвести это поведение с этой частью.
Убедитесь, что вы используете последнюю версию Chrome, Chromium или Firefox.
Sorry but I cannot reproduce this behaviour with this part.
Please ensure that you are using the latest version of Chrome, Chromium or Firefox.
Sorry, the problem only occurs in the firefox browser and only when you rotate left or right.
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Brand new interactions and interfaces. 
Easy to use and quick to get started. 