Colour change on full screen

I’m new to Photolab3 and have encountered a problem which I suspect is easy to fix but I can find nothing in the manual or online resources that addresses it. I’m using the Windows version of the software and running a calibrated BenQ monitor. I’ve been trying to edit some raw photographs and things are going Ok but when I switch to the full screen mode in the ‘Customize’ section of the software the colours in the image become noticeably more saturated. Starneglty this doesn’t happen with all images. Can anyone suggest why I might see such a colour change?

Thanks

Hello @DavidRoe,

Please, have a look at this explanation - JPEG doesn't look like RAW and the exposure is changing too Probably, this is the reason of your difference (as full screen mode is 100%).

Regards,
Svetlana G.