Setup and viewing happen on different surfaces
The official Japanese help tells the main account holder to create a Kids subaccount through the website’s family-account editor. It then explicitly excludes the website from Kids-mode use. Creating the account successfully in a browser does not therefore establish that the child should remain in that browser to open the Kids viewing interface.
Switch within a supported app after setup
The page describes signing into a main or ordinary subaccount in the iPhone, iPad or Android-phone app, then switching family accounts into Kids mode. It also documents a supported-TV route while warning that some televisions are not supported. Use the route for the actual device rather than applying the mobile menu word for word to a television. A child-oriented catalogue entry and a Kids-mode account are different observations.
Choose an end time or a duration deliberately
Within Kids mode, the publisher provides a time-limit control that can specify either a finishing clock time or a number of remaining minutes. Those choices suit different plans: finishing before a fixed appointment or allowing a short session starting now. The help says an existing limit must be removed before setting a changed one. It separately allows paid works to be hidden through main-account settings. No child account, timer or payment permission was created or tested for this article.