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This will also affect the Sequence View.
Note that the circular view is zoomed automatically when the Circular Viewer area is resized:
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It is possible to rotate the circular view using the mouse wheel. Also it is possible to shift the start point of a circular molecule by Edit sequence -> Set new sequence origin context menu item.
Use the Export ‣ Save circular view as image context menu or the Actions main menu item to save the image of the circular view.
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