According to PTC support Creo does not allow to display 2D representations of datum coordinate systems to conform to ISO 5459.
Creo does not mark the CS origin of coordinate systems with one axis normal to the sheet/screen with extensions of the axes and a circle. For ISO conformance it is also necessary to be able to rename the axes (X1, X2, ...) (section 7.9 in the standard). It should also be possible to place the CS tag (possibly via show/hide annotations).
The Creo (3D) coordinate systems already looks very similar to the 3D representation of datum coordinate systems in ISO 5459. The suggested improvements regarding the axes naming and CS tag placement apply to 3D coordinate systems also.