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Do you mean to say that you want to set maximum allowed characters in "Dynamic Textbox" widget? Please be noted that there is a "Size" attribute in the "Dynamic Textbox" widget which is used to set the max character that is allowed in textbox. It does not seems to work as expected.
I am not sure if it a bug but let me send a query to our backend team. We will get back to you as soon as we have any update from them.
The size setting has been fixed.
Please check again - let us know.