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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,
Pixel-to-Pixel. The last option
Pixel-to-Pixel allows you to see the accurate image that you will get by export in raster image format. The resolution of exported raster image is evaluated as a product of canvas size and DPI value specified in
Canvas tab of Figure/Fit Plot Properties window.