One way to do it is to try different window sizes and when you find one that looks good in Word, simply use the get and set functions with 'Position' key. For example:
1) set a breakpoint after the figure is completed in Matlab. Then adjust the figure size using your mouse dragging the corner. A trial an error approach. use the Command Window to call:
pos = get(gcf, 'Position');
save('pos');
2) once you get the size you like, add in code after the figure is created:
load('pos');
set(gcf, 'Position', pos);
