Very interesting guys.
So to summarize for everyone else:
How to turn OFF Grid Display by default in Viewpoints.
Viewpoint types have separate Grid Display settings so this series of steps needs to be performed in every Viewpoint type that displays Grid.
1. Go to the Floor Plan Viewpoint.
2. Activate the Grids & Background Dialog.
3. Click the Grid Display OFF button and click the OK button to accept changes.
Note: setting the "Grid Display" command in the menu will not achieve this same result, it will simply turn off the Grid display in the current Viewpoint but it does not affect future Viewpoints.
4. Create at least one Section Viewpoint and go to that Viewpoint.
5. Repeat steps 2. and 3. while in the Section Viewpoint. The result is that all newly created Section Viewpoints will have Grid turned OFF in them.
6. Repeat steps 4. and 5. for Elevation Viewpoints, Interior Elevation Viewpoints, Worksheet Viewpoints, Detail Viewpoints and 3D Document Viewpoints as well.
After doing this you may delete the Viewpoints you have created just for this purpose if needed. The Grid Setting will be kept by ARCHICAD even if no Viewpoints of that type exists in the Project File.
This same procedure can be done in Template Files as well.
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