Problem with rich black

I have a text in my .cdr file. I use the CMYK color mode. The text I have is 0% Cyan, 0% Magenta, 0% Yellow and 100% Key.

I publish the .cdr file to pdf, with these color settings:

 

Then I open the .pdf file in Adobe Acrobat. I go to Tools->Output preview to see the color separation. I choose Eurostyle Coated v2 from the combobox. The I turn the checkbox with Yellow on, and the other checkboxes (for the other colors) off. The problem is, I can see the text, even though Corel Draw says it doesn't have yellow in it.

Why is this happening? How can I fix it?

Btw my file is for making an offset plate, I don't know if that's relevant to the question.

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