• For Windows host, use Resize-VHD utility in PowerShell

  Resize-VHD (Hyper-V)

Disk image location:

C:\\Windows\\System32\\config\\systemprofile\\AppData\\Roaming\\multipassd\\vault\\instances\\

Resize-VHD -Path C:\\Windows\\System32\\config\\systemprofile\\AppData\\Roaming\\multipassd\\vault\\instances\\ -SizeBytes 15GB