Legacy System Extension warning when starting Parallels Desktop

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After installing/upgrading to macOS® upon starting Parallels Desktop, you may receive the following notification:

Legacy System Extension
Existing software on your system loaded a system extension signed by "Parallels International GmbH" which will be incompatible with a future version of macOS. Contact the developer for support.

Information

Parallels Desktop uses System Extensions to provide you with the best performance, functionality and seamless experience.
In the newer versions macOS® you may see this notification informing your that these System Extensions will be incompatible with future versions of macOS®.
Parallels works closely with Apple® to ensure that Parallels Desktop continues to function in all future releases of macOS®.

Starting with macOS® Big Sur, you can eliminate the need to use Parallels system extension altogether by switching to Apple hypervisor:

1. Make sure that the virtual machine is shut down. If it is in a suspended state, please run it and then shut down (Actions > Shut Down).
2. Open the virtual machine's Configuration (click Parallels icon || > Control Center > right click on the virtual machine > Configure).
3. Go to Hardware > CPU & Memory > Advanced Settings > and change Hypervisor to Apple.

Note: Parallels hypervisor enables some advanced features, such as nested virtualization. Therefore, switching to Apple hypervisor may not be advisable in cases when these features are essential.

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