How do I delete all the titles?

Hello @bobolab,

Thank you for contacting Rank Math support.

Unfortunately, you may need to remove them individually by editing the post as they are custom titles you have entered.

However, in the paid version, you can easily remove them via the post list view using the bulk editing option or via CSV file.

You may refer to our guides below on how to do that:
https://rankmath.com/kb/bulk-editing-in-rank-math/#custom-meta-title
https://rankmath.com/kb/editing-seo-meta-at-scale/

Looking forward to helping you.