Certainly screen viewing angle can be a factor, and other than always viewing with the same angle and from the same distance and under the same lighting I don't know of a solution to that when using a laptop.
However, two other big factors are whether you have color-calibrated your screen, and whether you are soft-proofing your image to see and adjust how it will print before you actually print it. Both of these are somewhat complex topics and I can't provide much advice on them.
There is an official Affinity video about printing on Windows that (I think) covers soft-proofing, or there may be one specifically about that.
Does your "??????" include a file extension, Steven? If so, it shouldn't do! For example, Patrick's link to ".../coreskills" gives me a download of the file named 'core_skills.zip', but if I try to go to ".../core_skills.zip" I get a 404 error.
Welcome to Affinity Forums :)
Seems you forgot to press the Attach button after selecting the images to upload. Can you please try again?
Here's how to attach a file/image to a post just in case.