I need to create a form where they will be 20 choices(time slots) in drop down menu. If a choice is chosen, it should be unable to choose from again. How can I do this.

Kindly advise, thank you.


When you add a column to a list, you can enable the "Unique" option:

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No two list items will be allowed to have the same entered value. Similar to a unique constraint in SQL Server.


How to prevent multiple selections of the same value in a drop-down in a table for your reference:


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