Cannot Print to Scale

My SketchUp will not allow me to print to any scale. The options have been greyed out, even after de-selecting both “Fit to page” and “Use model extents”. I’ve tried to change printers to OneNote, Save-to-pdf, and an actual Canon, but it doesn’t make a difference. Is there something I’m missing here? See below for what I’m looking at:

You can only print to scale from parallel projection. Perspective distorts lengths (deliberately - part of what it means). You will also get distorted scale (foreshortening) in parallel projection for edges of faces that are not parallel to the camera plane.

This solved my problem; thank you for your help!