TL;DR

• Requirements
  • macOS 11 host and guest
  • VMware Fusion 12.1
• Download and install VMware Tools 11.2.5 or later
• Edit the VM’s VMX file
  • Right click the VM
  • Hold the option key
  • Click Open Config in Editor
• Add appleGPU0.present="TRUE" and svga.present="FALSE"
• Enjoy