Having an option like a button or a listed "Expression" such as...
"Add All" (fields)
on top of the Existing table fields would be neat.
It is often quicker to delete the few unwanted columns from the form...then it is to add them one by one - as it done is now. :)
When adding a new component you have the option to "Quick Add" which adds all of the fields
Oh, I had never used that button before....tks