Which links? Those that are at the left of our explorer.
You can edit the registry by hand but it is a bit chore. Or you can use this little application.
Those services are visible in the explorer using a registry value called System.IsPinnedToNameSpaceTree. If the value is 1, then it is visible in the Explorer, otherwise, it is not visible.
But it also determines if the (default) value is set.
You can check the source code or directly runs the executables.