User-734925760 posted
Hi,
According to your description, we want to display the long string in the reportviewer and it will display line by line.
I have a suggestion for this problem but with TextBox control. We can set the CanGrow property of the textbox to True, then if the length of the text is too long, it will break into next line base on the width of the textbox.
Hope it's useful for you.
Best Regards,
Michelle Ge