Procedure

Identify the Applet name and the Data Item associated to the Applet
Navigate to System Mobile > Mobile data Items
Open the Data Item
Add related list called "Screens"
There should be some record in the related list, open the one for table "sys_sg_details_screen"
In the record there will be a field call "Item View" , open that record
When you open the item view, there will be a field called "Dependency fields". This is where the columns are defined

Applicable Versions

Madrid and forward