like what it says in the docs

CommandX [X CO-ORDINATE] The horizontal co-ordinate of the Command Box's screen position.
Default: 0

CommandY [Y CO-ORDINATE] The vertical co-ordinate of the Command Box's screen position.
Default: 0

CommandWidth [NUMBER] Sets the width of the Command Box, in pixels.
Default: 160

CommandHeight [NUMBER] Sets the height of the Command Box, in pixels.
Default: 20