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What's existing is that when clicking the + button on a "Link to another record" column, it shows a "search box" and we can find an existing record, but you can only search for the linked record's value. It would be more efficient to be able to find an existing record using its other parameters (maybe the four columns that are shown).
In the example image below, if I type "Notes C" or "1335", it should show Item 3. What's currently happening is I should strictly type "3" or "Item 3" to get to that linked record. It's especially inconvenient if it's a lengthy SKU or something like "A Very Long Title Like This and That Vol. 3" when I could use that linked record's other columns to find it.
It allows the user to quickly find a linked record through other parameters and makes workflow more efficient.
The first four columns on the find field are the linked table's first four columns too, so if the user wants to "customize" the first four columns, they can trigger "Limit record selection to a view" when making that linked record column to use that specific view's first four columns.
Users who use linked records a lot with multiple useful columns.