You can export your design to an image file in PNG format from the Design tab using the menu item File -> Export Design as Image File. Any image viewing or editing software can open files in this format.
Note that this will save your design as an image at screen resolution, which is much lower quality than printer resolution. If you print an image that has been captured at screen resolution, it will appear low quality and blocky (pixellated). If you want to print your design, it is better to print directly from the program using the menu item File -> Print -> Design Diagram. If you wish to send an image to someone else to print, it is better to print the design to PDF and send the resulting file. In any case, there will always be some small loss of quality printing from a PDF, and the appearance of your design may be slightly altered.
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