How to restrict users to select only one value in a look up column.

Scenario: I have a look up column and i want users to select only one value Look up

Example: For Opportunity ID (originally a number column for another list) is a look up column for this document library. I have selected 4, 6 and can select more. I want to restrict users to only select one choice 4 or 6 or any other number, but just 1 value.

Any suggestions will be appreciated


1 Answer 1


Go to list/library settings->find and click the lookup column, in the edit column page, select “yes” for Enforce unique values or unchecked the “Allow multiple values”.

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