How to hide list of RPs from everyone?

Hi,

I have an infrastructure with ADFS and ADFS proxies. My issue is that whenever someone (understand anyone on the Internet not related to my company) goes to https://sts.contoso.com/adfs/ls/IdpInitiatedSignon.aspx , he/she sees all the RPs defined on my system. That can be sort of "by design" but am I the only one concerned by this?

Is there a way to hide this, or a good reason to keep it?

Thanks,

LB