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Use Project → Image Preview
menu item to open image preview window.
One can select between setting zoom in % of real size (the size will be actually real only if the dots per inch (DPI) is right set in your operating system). Other options are fit to window, fit width, fit height. The last option Pixel-to-Pixel
allows you to see the actual image that will be exported in raster with account for DPI value specified in Canvas
tab of Figure/Fit Plot Properties window.