Extra Features: automatic volume unmounting
TrueWidget provides a feature to automatically unmount volumes when it launches for Macs used for verification/testing that have multiple macOS versions installed.
Notes
Automatic unmounting is performed only once per volume after macOS starts, so if you manually remount a volume after it was automatically unmounted, it remains mounted.
TrueWidget Privileged Helper
To use this feature, you need to enable the TrueWidget Privileged Helper in System Settings.