Example from Windows:
A way to enable the grayscale filter on the whole system.
Question is how to do it in Linux/ZorinOS.
Is that Windows? Hard to tell nowadays because Windows mimics Linux.
You can install a Gnome shell extension called "Bedtime" that seems to do the trick:
I keep forgetting if the Extension Manager is installed by default. If it's not, you can search for it first in the Software Store. You can then use it to search for and install this extension.
Although, it doesn't seem to work so well under Wayland:
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At least you can pick what mouse cursor you want to use next, windows does not have that feature 
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FINAL, ACTUAL SOLUTION:
Turn on 360° greyscale - click to install the function
On the above website next steps are:
1. click (opens the window) -> 2. click (question/confirmation requires 'yes') = finish/done - function installed
Above solution works/ed on at least firefox, chrome.
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