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In the Family Safety main window, you will see a dial at the top left portion of the window, showing whether the filter is on or off. You can disable the filter by clicking on the dial. You will be prompted to sign in using your Windows Live ID in order to disable it. As soon as it has finished, you will have successfully disabled the filter. To re-enable it, you will just have to repeat the process.
To go further and uninstall the feature, read on.