In v17 you can't disable restricted Youtube mode selectively while using WEB proxy and web policies when Enforce SafeSearch is enabled.
I was able to do this in V16 by disabling HTTPS decryption but this is no longer working in V17. So fix to v17 disabled possibility to apply my workaround.
from sophos ideas:
Restrict YouTube via HTTP Header for some user groups - MARKED AS COMPLETED WHEN IS NOT
ideas.sophos.com/.../13618821-restrict-youtube-via-http-header-for-some-user-gro
separating “YouTube Restricted Mode” from "Enable SafeSearch" is under review
Per-policy control for SafeSearch - is under review
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