How to add rental properties to enterprise for safe harbor?

When I entered my second residential rental property info it said to be sure to add other properties to the enterprise. But the program gives no clue on how to do this.

 

I selected safe harbor for the second property as discussed above. Is there a way to undo that?

 

When I entered the data for the first property it did not ask about the safe harbor or wanting to make it part of the enterprise.

 

Also I see this IRS safe harbor provision has been in effect for a few years now but do not recall Turbo Tax having any information on it in the past. Did I miss something?