"Find Overset Text" Function
The overset text [+] icon can be easily overlooked in a busy document.
There needs to be a way to cycle through text boxes with overset text.
The way the Find/Replace Font dialogue cycles through and focuses on results would be acceptable.
These would be the minimum required buttons.
Find (Next)
Done (Cancel / Exit)
For an efficient workflow, include a preview of the overflowing text within the dialogue .
A "Delete Overset Text" button adjacent to the preview could save a lot of time since overset text boxes often just contain a stray line break.
This function would pair well with the suggestion on an Overset Text Warning on Export (like InDesign)
https://illustrator.uservoice.com/forums/333657-illustrator-desktop-feature-requests/suggestions/50350371-overset-text-warning-on-export-like-indesign

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A free script solution exists meanwhile to find these:
https://community.adobe.com/t5/illustrator-discussions/alert-if-the-document-contains-overset-text-warning/m-p/13591936