Can you specify the laptop model/brand and OS please, that i could look for full specifications.
Usually the integrated vga/gpu share the graphic memory with the system memory.
In the laptop bios there is often an option to set up the amount of memory allowed to the integarted vga.
So you could increase or decrease this amount depending your needs.
Would be nice have some screenshot of where you read 80Mb on the R5.
Would be nice you explain a bit more what your issue is, if there is any.