Hello,
We apologize for the issue you are facing with the Titles and Meta settings screen not displaying properly. Since you’ve already tried using an incognito browser and cleared your cache, it might be helpful to check if there are any conflicts with other plugins or themes on your site.
If the problem persists, please reply to this ticket with your site URL so that a human agent from our support team can assist you further. Thank you for bringing this to our attention!
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hello,
We sincerely apologize for any inconvenience that might have been caused due to that.
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/
Looking forward to helping you.
Thank you.