The Parental Control setting lets you choose what kind of content is visible on your Rakuten TV account.
To configure this setting in the new Rakuten TV app:
Log in to your Rakuten TV account and scroll down until you find the "Settings" button.
You can also press the red button in your remote control and choose "Settings". Here you can choose the level of Parental Control you want to apply.
If you are using another device on Rakuten TV, you can perform the same action by also accessing the "Settings" section. In either case, you only need to do this once, as your Rakuten TV user preferences are automatically synced across all devices on Rakuten TV and the Web.