On /admin/structure/types/manage/*/fields.
The list of fields should show some essential properties like cardinality and whether the field is required.
Why?
An overview of fields with cardinality and requiredness is useful in a number of situations:
How?
The typical way to do it would be to introduce columns for each property that should be exposed.
This would easily pollute and clutter the table.
Instead, add a single column with a list of the properties, possibly using icons or symbols to indicate cardinality and requiredness.
An explanation can be revealed on hover or click/tap.
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Idea
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