Hello,
Thanks for contacting Rank Math, and sorry for any inconvenience caused.
Please ensure that the Add SEO Controls option is enabled at Rank Math > Titles & Meta > [Your Post Type] > Enable Add SEO Controls

Do note that some options are only available when you enable the Advanced Mode in the Rank Math dashboard:
https://i.rankmath.com/JAj5ak
If the issue persists, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
I logged into your website’s admin area and upon investigating, I found that when you disable the Gutenberg editor with the “Disable Gutenberg” plugin, the “Advanced Custom Fields PRO” plugin starts conflicting and causes the issue.
Please have a look at the screencast in the sensitive data section of this ticket. You can get in touch with the support of the “Advanced Custom Fields PRO” plugin as they might already have a solution for the issue and they would be in a better position to assist you.
Hope this helps.
Thank you.
Okay, I will contact them! Thanks a lot!
Hello,
Glad that helped.
Please feel free to reach out to us again in case you need any other assistance.
We are here to help.
Thank you.