Subform: Quantity of Add Rows...

Subform: Quantity of Add Rows...

I have a subform, right now it seems to be like I can´t add more rows, I have 16 Rows. I put on the edit field of the Subform max rows = 30, but it seems to be that its not working. How can add more Rows for the Subform?.
 
I will appreacite any help on this.
 
Victor Miranda