Large function does not appear in Power Pivot measures

Good afternoon everybody,

I hope you are well.


I have a list with all the sites, the overdues and the period.
On tab "Power Pivot" I want to add a new measure to display top 5 sites (with highest number of overdues) per each quarter by using a slicer. In order to do so, I am using Power Pivot to change the measures of slicer. I want to use the function "Large" but it is not there when creating the new measure.

Anyone can help me, please?

Thank you