run Optimize-VHD -Path "C:\ProgramData\DockerDesktop\vm-data\DockerDesktop.vhdx" -Mode Full where the path is the path as documented in the docker desktop settings > Resources > Advanced > Disk image location.
run Optimize-VHD -Path "C:\ProgramData\DockerDesktop\vm-data\DockerDesktop.vhdx" -Mode Full where the path is the path as documented in the docker desktop settings > Resources > Advanced > Disk image location.