Create your own document profile for this.
You're probably using Global Rulers. Right-click on a ruler and choose "Change to Artboard Rulers".
Probably completely irrelevant here, but it is also possible to change to the old way, bottom left corner.
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DayForce has the answer. if you have not changed the orientation then you only have to select thartboard you wish by clicking in it or select art on it and the rulers change to orient themselves to the artboard.
Notice as the artboards are selected the 0 position chages to reflect that selection
Make sure you do not have Global Rulers checked
Thanks a lot everyone, my headache is gone