There seems to be no way to turn off the "Dimensions" in the new "Grid tool" where can I find this option or how can I turn those dimensions off?
Under Drawing Settings, the Dimensions are controlled by the Dimension Styles dialog box click on magnifying glass icon in the Dimensions area. Under "View Attributes" you can choose to have "Dimensions" ON or OFF.
To turn Dimensions "ON" or "OFF"
So what if I need grid dimensions Off, and dimensions for other objects On in a drawing model? There is no way to define Part/Family (i.e. Level) for the grid dimension in order to filter it off by level. They go off with whichever Part/Family level the Drawing Settings grid "lines" are defined.