You can't. Your laptop utilizes Intel's GFX chip that is inside of the CPU inside of that laptop. It idolizes turducken for some reason. The chip in there doesn't have any memory so it has to borrow system RAM. The only way dedicated memory is available is when you have a dedicated GFX card such as a 1060m(mobile version of 1060). That dedicated GFX chip has either 3GB or 6GB of VRAM depending on the model.
You have NO actual dedicated video memory as ALL of it is system RAM. The Intel driver can change the reported amount of system memory that is reserved for video use to programs, but this is not the same as dedicated video memory.
If you had wanted dedicated video memory, that laptop was available with an AMD Radeon GPU that did indeed have dedicated video memory.