>I don't remember how I turned that off - was it a checkbox ? Or I may have set the width to zero

I found something in the data dictionary that didn't work that enable numeric range. The values of the minimum 100 and the maximum 400 were there. But, the switch to validate was off. I adjusted your account and two others who were in the same situation. If you do a full refresh of the interface, you will get it.

Thanks for notifying and commenting on the issue.