This function can be used to set the x position of the given view port. You give the view port index (from 0 to 7) and the new position to place it at.
Argument Description view_port The view port to target (0 - 7) x The new x position
if view_get_xport(0) != (display_get_width() / 2) -
(view_wport / 2)
view_set_xport(0, (display_get_width() / 2) - (view_wport / 2));
The above code will check the x position of the view port and if it is not where it is required to be it is set to that position.