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Thank you for joining the Graphics community.
I just wanted to let you know that 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 I am afraid that is not possible to change it.
If you are interested in additional information see graphics memory frequently asked questions: Windows® 10 Graphics Memory FAQ.
Hope it helps