I have fields that should be enabled only when add new Item.
For this I used expression "Is New Mode" on Appearance option \ Enable.
It's worked correctly while we didn't receive updates to version of Nintex forms 18.104.22.168
After that any rules can't block Multi Line Textbox.
Someone know solution?
I think the best way to accomplish what you want is to have a rule. You can click "add rule" in the ribbon once you've selected your control:
And then format it like this:
by clicking the f(x) next to the condition you can get your usual settings like Is New Mode and such. Make sure you check the "disable" box!
Yes, this variant works, but a little bit in other way that it were.
Main question, that it worked before update on new version of Nintex form, and still works for other types of fields.
Variant that you proposed works and block text input, but it's look like ready for input.
But if we block in my way it just grey color for text display.