How do I set Youtube for 1080

On Youtube, the livestream gets up to 720. What settings should I check so I can ensure Youtube will show as 1080?

I searched here, but didn’t find the answer I was looking for.
https://www.epiphan.com/userguides/webcaster-x2/Content/2_YouTube/stream-pre-configure.htm

You would need to change the Encoding Resolution, which is not specific to the platform so the settings are talked about in the User Guide as a general setting
https://www.epiphan.com/userguides/webcaster-x2/Content/3_Shared/tip-set-stream-resolution.htm

Thank you!, I check this out.