Hello,
Thank you for contacting Rank Math today.
I have attached a screencast showing you how to do it: https://i.rankmath.com/J4Am7g
Looking forward to helping you. Thank you.
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I am getting same issue also, only main page indexed properly. I am using custom post type also. there are lot of posts.
Here is my site: https://www.lyricsaio.com/
please check once
Hi
Many thanks for your reply.
Unfortunately I do not see an advanced tab.

Hello,
Could you make sure to set Rank Math in the Advanced Mode (as I show you in this screencast: https://i.rankmath.com/6MG0Yg) and after that try again?
Let us know.
Looking forward to help you.
Hi Alberto
That’s fixed it. Many thanks, new it had to be something simple.
Hello Mike,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.