Tables - How to fit the rows in the placeholder?

Hi, I have this problem where I can't fit the rows in my placeholder/text box. I have too many rows, so I get the red + symbol.

I've tried to select the whole table and click "Distribute rows evenly" and also "Distribuate columns evenly", but nothing seems to work. I've also tried to make the table bigger and smaller with the arrow in the corner, but nothing happens. 

It's just like I can't make the cells smaller, so there's space for all the other rows?