Your queries might return more fields than you need in your table, even though you don’t want to show it in the table but you actually need it. For example, the result should return an url , you don’t want to display the url, you want people click on another field but that click should link to your url. So that’s why you need to hide some column.
It’s pretty simple, on the Edit Panel , on the left , next to the Query , there is “Transform” tab , click on it , then select “Organize fields” , there will be an option for you to hide your columns. This screenshot show you where the transform tab is
