Hello,
Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.
Do note that some options are only available when you enable the Advanced Mode in Rank Math. If it’s not showing, you must have chosen to use the Easy Mode. Please follow the steps in this link to switch to Advanced Mode:
https://rankmath.com/kb/advanced-mode/
That should reveal the advanced tab in your editor.
If the issue persists, please let us know and we will help you resolve the issue with regards to your canonical.
Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.