There is no replacement for the graymon function, but you can
choose between light and dark figure themes. For more information, see Graphics and App Themes.
The graymon function issues a warning that it will be removed in a
future release.
You can also select a web site from the following list
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.