How can I display all column value 'True' while adding columns?

[Pra]

Hello, I am new to the servicenow development. I have created the table "Test123" and added column 'A', 'B', 'C'. When the display value 'True' is set for column 'A' then the column 'B and C' display values changes to 'False'. How can I set all column display value 'True'?

[DScroggins]

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