P: Full Screen mode: Print & Book modules show wrong colors but output correctly

Print does not display the Soft Proof render. That is only available in Develop. I would expect a Soft Proofed image to differ from it's print module version.

I am working on this.

@lorin_duckman  

No. forget about the print. the image on the screen changes when I move from develop to print.

Image from the print module.

Let me ask a different way. Which statement is true:

1. The Print looks like the preview in the Print Module
2. The Print looks like the preview in the Develop Module

A set of comparison screenshots showing the difference would go a long way here. 

Nope, they come up looking like the develop screen, flat.

So the Print Module Preview Screen is not matched but the actual Print is to the Develop view?

Printer - Epson P 800. OS is Big Sur. Computer is an iMac. But the change occurs as I go from the Develop mode, proofed, to the Print mode, before printing and then the prints come out looking like screen.

I am not seeing any difference on Mac 10.15.7. 

What is your OS and Printer?

I can confirm what Paul Manuel says: the same problem occurs in the Library module when zooming in to e.g. 100% or more.

However, I notice that the photos not only show up less saturated in colours, but do miss certain basic edits, such as White Balance and Contrast.

For what it's worth, I'm seeing this problem on RAW photos of three different Sony cameras: Sony A900, Sony A700, and Sony DSC-RX10.