Got it. Thank you.

I've just installed 2.4.2.
Any idea why it cannot run properly in iFrame?
Thank you.

Thanks Joe. It is better than the 2.3.21.
Well done team!

I've just installed 2.4.2 and the Reference number fields setup screen cannot be found.
It used to be in "Forms Setup". Can anyone tell me where to find this option?
Thank you.