Don't be misled by the name, Start10tweak. It works on Start11 also.
Clicking "Disable Start10 Service " or "Unload Start10 Now" will only disable Start11 until you restart your computer, when it will be reenabled. If you want to disable it, and remain disabled after a restart, you will have to uncheck "Start10 should be enabled in this user account." To reenable Start11 again, open Start10tweak and check "Start10 should be enabled in this user account," and then manually start Start11.exe or restart your computer.