Unfortunately, I haven't found a sensible way to edit those fields directly once the table has been generated.
Whenever I need to make a changes, like adding a new column or renaming things I usually find it’s much faster to just delete the old table and insert a new one with the correct settings.
Technically, you can try selecting a column header as an individual element and editing it that way, but it’s not very user-friendly and often ends up being more trouble than it's worth.
Thank you. I do the same, but as you mentioned, it's not user-friendly :)
This is definitely something that could be improved. Adding logic to the templates would also be helpful.