The North Axis input field for the Building of EnergyPlus or OpenStudio models rotates the building's north axis to be is relative to true north (green line in your screen shot). Positive values rotate the building clockwise from true north.

Note that this input is ONLY used if theGlobalGeometryRules object uses "Relative" coordinate systems. If you are using "World" coordinate systems (or the alternative "Absolute" option available in EnergyPlus versions 9.2 and earlier), then you will need to rotate the building geometry directly.