On Windows 11, you can use the "Windows Sandbox" feature to create an isolated lightweight virtual machine to test ...

To enable Windows Sandbox in firmware, ensure your system supports virtualization. Access the BIOS or UEFI firmware at startup and enable the virtualization setting (Intel VT-x or AMD-V).

Nested Virtualization lets you run a Hypervisor inside of a Virtual Machine. Windows 11/10 has introduced Nested Virtualization. Here is some information that might interest you.

Microsoft has accidentally revealed an internal 'StagingTool' utility that can be used to enable hidden features, or Moments, in Windows 11.