This seems like a bizarre question to have to ask - why are my grid lines not perfectly horizontal and vertical?
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1Is your monitor level? – mayersdesign Apr 5 '18 at 13:42
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@mayersdesignm in the image you can see that it's rotated. (Not the monitor) – WELZ Apr 5 '18 at 16:15
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@WELZ I think it was a joke (I hope it was) – Luciano Apr 6 '18 at 9:05
Ah... It was this - the whole canvas got tilted somehow.
https://forums.adobe.com/thread/2410631
To correct the rotation...