the page editor does not show lines SEO Meta Box

Hello,

Thank you for contacting the support and sorry for any inconvenience that might have been caused due to that.

Assuming you are using the latest version of all the plugins and the themes (please update if not yet), it would seem like a conflict with one of the plugins or the theme you are using.

To determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/

Here is a video you can follow as well:
https://www.youtube.com/watch?v=FcIWRhcUP2c

Only the site admin would know and your users won’t be affected by this troubleshooting.

If the issue persists, 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/

Please do take a complete backup of your website before sharing the information with us.

We really look forward to helping you.

Hello,

Please share access to one of the sites with us so we can help investigate the issue.

Thank you for choosing Rank Math

Hello,

We checked your website and we can see the Rank Math SEO Meta box is working properly without any issues. Please check the screenshot in the sensitive data section for reference.

If you’re still facing the issue, please share a screencast by using a tool like https://loom.com so that we can check this further for you.

Meanwhile, please try to check with a different browser or in the incognito mode of your browser and see if that works for you.

Let us know how it goes. Looking forward to helping you.

Thank you.

Hello,

We are glad that helped.

Can you please confirm if you still need our assistance with anything else or we can close the ticket?

Looking forward to hearing back from you.

Thank you.