This message was posted on behalf of Intel Corporation
In most cases, the computer manufacturer has already configured the system to use the maximum amount of graphics memory that is possible for your particular computer model. Sometimes you can change these values through BIOS level, if there are no options available in the BIOS then is not possible to change it. I would recommend checking with your computer manufacturer if there are tips on increasing the amount of graphics memory for your computer model.
If you are interested in additional information see graphics memory frequently asked questions: Windows® 10 Graphics Memory FAQ.