why are the page settings dissapeared????

Hello,

Thank you for contacting Rank Math, and sorry for any inconvenience caused.

You can share screenshots using https://imgbb.com/.

If the SEO settings are not saved, please ensure that the Rank Math plugin is updated to the latest version.
https://rankmath.com/changelog/free/

Then, clear the Rank Math transients by going to Rank Math > Status & Tools > Database Tools > Remove transients

Once done, clear the website and browser cache and check again.

If the issue persists, check if you are using a Firewall, as there are chances that it will prevent saving the data. You can check this link for more information:
https://rankmath.com/kb/meta-data-not-saving/

I hope this helps. Looking forward to helping you.