Can I set a minimum or a maximum value for numeric fields?

Yes. You can accept input no higher or no lower than a specified value. In your Form Editor, click on the numeric field to open its Edit Field panel. In the Advanced tab specify a Minimum Value and/or a Maximum Value

Limit values for form numeric fields

If form users enter values higher or lower than the specified value, they will get an error message. By default, the message says: The value must be higher/lower than X. This message can be changed in Settings – Translations – System Messages.

Limit values for form numeric fields