At my first install of ZorinOS the native night light function worked instantly. Somehow it stopped working properly. The night light only works while I am in my night light settings (which is set to Sunset to Sunrise), when I adjust the scale. My settings are definitely correct. Since I had this problem and nothing worked to fix it I chose to re-install ZorinOS. After re-intsalling ZorinOS on the same system, using the whole drive, the problem now persists. Since it worked on the first install, this must be a software issue. Since re-writing the whole SSD with the same OS, it must be a deeply seated software issue, that can not be resolved by re-installing the OS. Also redshift provides a software based layer on top of everything you see. It does not go to hardware level to adjust the colours. It looks ugly in comparison. That is not a solution for me. I also upgraded and updated my OS in the hopes that it would change something. There is one difference between the first and second install of Zorin OS. I lost the first USB with which I installed ZorinOS initially, after the problem appeared, I made a new USB with the same ISO in the same way, with less GB on it. I doubt that this could have relevance. Also, I am using Wayland, I did not pay for ZorinOS and I am using the most recent version I believe, if that is of any help.
P.S: Why is every linux OS always such a pain the *** when trying to do the simplest things? Every once in a while I come back from Windows, just to be confronted with something nobody else was confronted with on Linux.