Click on the View menu, then select Rendering then Fast (XOR).
If that doesn't work for you and you are looking to compare Gerbers, there are some Gerber comparison utilities available on line. (Search for "compare gerber".)
There are also utilities available for comparing .JPG and .PNG files, etc. To export a .PNG file for further processing, click on the File menu then select Export then PNG... You may want to specify a higher resolution (DPI) than the default in the export dialog.
If you're handy with Inkscape, another option is to export an .SVG file (or files).
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