Content filtering has been added to family profiles for certain configurations, replacing website blocking.
With content filtering you can block categories of content, for example "violence", rather than having to block sites one by one.
You will be able to see a history of sites that have been blocked by content filtering and have the option to allow them if you need to adjust the default filtering. If you allow specific sites they will be available to everyone on your network.
If you previously used website blocking, those specific sites will no longer be blocked and you can use content filtering to block categories of content instead.