Pick the answer type carefully. *Date*, *Number* and *Currency* sort by value; *Text*, *Yes/No* and *Bullet List* sort alphabetically. And editing a column later — its label, its prompt or its type — clears that column's answers and extracts them again.
## Add columns
Each column is a question Libra answers for every document. A Discovery holds up to 50 columns; past that, adding another is refused and you have to delete one first.
### Verify a cell
Click any cell and a panel opens on the right with everything Libra used to extract that value, for the whole row, not just the one cell you clicked.
