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Unfortunately, only the first name and last name can be required in the Quick Tools - Full Name.
However, you can still create 3 text boxes on the same row. You just need to reduce the width of the text boxes to 15 and make all of them as Required.
You also need to make the label align in the Top.
You also need to use the Shrink option to position the 3 text boxes into 1 row.
Here's the result:
Hope this helps. Thank you.