This is an App Inventor Project so anything is possible but not necessarily probable.
Might be easier to just delete the parts of code that spawn multiple rows. Just download the aia, make a copy of the app and experiment. Re-make it the way you want your app to be. 
Don't duplicate it but capture the pieces Marco coded that do what you want it to. @marco_tanzi made a real neat app. Everyone can learn from it.
