Does free Katalon allows DDT Test ? (buttons are hidden)

I am trying to test DDT but buttons add, delete, clear are hidden in “Variables tab”.

https://drive.google.com/open?id=1GjM2oUI5X17dcEOIkMHj4FTa6JyglnLn

I can’t access that image, is it shared to public?

is there any e-mail i can send you the images (or the permission to access them) ?