Use Project → Image Preview menu item to open image preview window. You can also use the Preview button of the toolbar or Ctrl+Shift+P keyboard shortcut (Cmd+Shift+P on Mac).

In preview mode you can:

• Preview in gray scale
• Transparent images can be previewed on selected background color
• Change the zoom of the image

There are several options for the size of preview:

• Percent of real size. Note: The size will be actually real only if the dots per inch (DPI) is correctly set in your operating system
• Fit to Window, Fit Width, Fit Height — fits the size of previewed image to window dimensions
• Pixel-to-Pixel — allows you to see the accurate image that you will get using 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.