To uninstall Windows Sandbox:
- Open Settings.
- Go to System > Optional features.
- Select More Windows features.
- Scroll down, clear Windows Sandbox, and then select OK.
If the recent update is causing broader issues, a Windows update can also be uninstalled from:
Start > Settings > Update & Security > Windows Update > View your update history > Uninstall updates
Note: some updates cannot be uninstalled.