My understanding is that EE has its own CSS modifications area. If that is the case, give this a try.

/** Hide the star ratings **/

rating {
    display: none;
}

I am guessing if you disable it by course that it applies to all both root and EE if you don’t have a separate instance of the course for each EE.

I am unsure on that because I don’t have EE.

@gstager, you are correct. Extended Enterprise will allow for unique domain-specific CSS to be applied.

After selecting a specific domain, click Configure Branding and Look:

Next, select the dropdown for Custom Styles and enable the CSS area:

@gstager, you are correct. Extended Enterprise will allow for unique domain-specific CSS to be applied.

After selecting a specific domain, click Configure Branding and Look:

Next, select the dropdown for Custom Styles and enable the CSS area:

 

Thank you @John . Do you know which code is for the rating stars- the icons-? I´d like them bigger…. :)

Seems like: 

label .fa-star-o {
	font-size:30px;
}
.fa fa-star .filled {
	font-size:30px;
}

First one does the stars empty state, second when full. 

Awesome! Thanks @Bfarkas 

@Isram - Bfarkas is too fast for me. :)

@Bfarkas  Help . I changed both sizes, however fa-star. filled doesnt change size.  Any idea? 

It’s .fa fa-star .filled , would be helpful if you post what you did though for us to troubleshoot.