Hm, you could try to disable the Zorin tiling shell to see if it helps, but I'm not sure, I can't test it with the Zorin 18 live stick.
Go to Zorin Appearance > Interface > Advanced Window Tiling
and turn it off for testing.
But perhaps you like this function and want to keep it on.
Edit: I tested it and "Active screen edges" are not reset after logout or reboot when the Zorin tiling shell is disabled.
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