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Select either the Export Tree Image toolbar button or the Actions ‣ Export Tree Image item in the main menu.
In the submenu that appeared select the Screen CaptureSave visible area to file... item to save the tree image to a raster format. The standard Save As dialog will appear where you can select the file name and format.
To export a tree image to a vector format select the As SVG item Save whole tree as SVG item in the Export Tree Image submenu.
To copy a tree to the clipboard select the Copy to clipboard submenu.