I just discovered the Document Title field (https://frappe.github.io/erpnext/user/manual/en/customize-erpnext/document-title.html) and have been tweaking that to my liking.
However, for doctypes where I had to add the custom field title, all my original documents don’t have the title data set. Is there a way to “update title for all” so that my older documents get their title properly applied? Screenshot should explain: