In part I, I have shown the correct command which should be used for caePrefsAccess module in ABAQUS Scripting Manual.

And next, the interface can be modified in the similar manner. You cae adjust toolbar position by change coordinate of toolbar and visible or not (python method 'updata()' for change, 'pop('',None)' for delete). 

Note: When calculating coordinates, 9 pixels for separate symbol and 26 pixels for each icon.

And then enjoy your own ABAQUS interface.