Calculated Column - Issue

Hi Guys

I am new to HANA world, trying to create a simple calculated column in Attribute view. When I am opening the editor to create the calculated column, i dont see the "OK" button at the bottom. This sounds strange but becasue of this, I am not been able to create calculated column in attribute view.

I guess this might related to font size/window size of the editor but I have no clue where to look at.

Thanks for your help