I forgot how to change the FM display settings to show high quality graphics...

Depending upon the application that created the EPS, you might be able to specify the preview resolution.

If you only have the EPS files and not the source files nor applicaton that created the EPS, then you could use Acrobat/Distiller to convert to PDF and save back out as EPS. The EPS from this route is at a much higher resolution (and in colour) than from most other applications. FM can also use the PDF directly,  but it converts it internally back to EPS anyway, so if you have lots of these, just do the conversion once.

re: These are vector eps graphics, they are not actually blurry raster images.

Unless some feature was added to FM after the newest version I've used (FM9), you are remembering a feature that isn't there. You can turn graphics on or off, but you can't control how FM previews them.

In the specific case of EPS images viewed at 100%, what you see in preview (during edit), and when printing to a non-PostScript(like) printer, is a 72dpi indexed color or grayscale thumbnail.

You can hack around this by using a decent vector editor, like Illustrator, to redefine the size of the image by 400%. Then scale it in FM to 25%. You are now working with a fairly crisp 288dpi thumbnail.

There are diminishing returns above 4x for the scaling trick. Scaling also increases the size of any PDF generated, because these hi-res thumbs are large data objects, and being indexed color, are largely incompressible. Use Acrobat (Std/Pro) downstream to remove metadata, because there's actually almost no reason for those thumbnails to remain.