ProSelect can show prints at actual size for any sizes that you want.

It uses the sizes setup in the Print Paper Sizes (under the Orders menu). The default installation includes standard sizes up to 40" x 60" (remember you can display in inches and cms).

If you wish to project at any other/larger sizes, simply open the Print Paper Sizes Dialog (under Orders Menu in ProSelect) and enter your new sizes.

Please see the article Projecting at actual size for more on this.

However if you see a yellow warning symbol in the bottom right corner of the image (or a blue box around the image for pre-2015r1 versions) and a message saying "Scaled to Fit" in the right corner of the Info bar at the bottom of the screen, then please see the article Scaled to Fit message & Yellow Warning in Select Size View.