Restricted Mode is an optional setting that you can use to help screen out potentially mature content that school's don’t want students to see. This is used by libraries, schools, and public institutions, who choose to have a more limited viewing experience on YouTube.
https://www.youtube.com/watch?v=E-JhyuCv2I4
1.Sign in to YouTube with your school google account, if not already signed in.
2.Enter what you’re searching for and then filter the results by videos or channels.
3.Click the video or channel that you want to approve.
4.Choose one or both of these options:
5.Below the video player, click Approve to approve the video for everyone. At the top of the channel page, click Approve to approve the channel for everyone.