You would have to know the source to answer that Q.
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How you treat them depends on the data they contain and what you need to do with that data…
- Expanding to new rows will lead to “duplication” of all other fields in that row if there is more than 1 item in that List.
- Alternatively you could “Extract values” combining them into a single text string (and optionally separating those into new columns (if that makes sense for your data))
- or aggregate the results into a single value if for example you have a numerical field in that list
- However if you don’t need the data at all, don’t bring it in or just delete that column
You’ll have to make sense of that…