you can update the whiteboard title through the content tree via ... → rename.

The max size of a whiteboard title is currently 60 characters currently. 

This means you can type over 60 chars while renaming a whiteboard, and if you try to save it, you just get a generic: "something went wrong" error flag.

It would be great to increase the limit from 60 chars while editing a whiteboard title, or provide a better error message for exceeding the max title length.