If you are using KernelSU, you need to allow superuser list manually all package name listed in package.txt (and your home launcher app also) (enable show system apps) and reboot afterwards
If you are using SUList, you need to allow list manually your home launcher app (enable show system apps) and reboot afterwards
The sound effect is enabled by default. If you want to disable it, then tap Dirac Toggler app and grant the root access. If you want to re-enable it, then tap the Dirac Toggler again.