mass canonical

Hello @labalme,

Thank you for contacting the support and sorry for not following up quickly and any inconvenience that might have been caused due to that.

We would not recommend changing the Canonical URL of a page that is set to index to anything else but that page.

If you still want to do it, here’s a quick tutorial:
https://rankmath.com/kb/how-to-change-canonical-url/

If you want to do it on multiple URLs at once, you can use the PRO version of the plugin for the same:
https://rankmath.com/kb/bulk-editing-in-rank-math/#bulk-editing-modes

Hope that helps.