Hello,
Thanks for contacting us.
Can you please make sure that you are using Rank Math’s Advanced Mode as some options are only available in the advanced mode? Please navigate to WP Dashboard > Rank Math > Dashboard and switch to Advanced Mode:

If the issue persists then please share some screenshots of the issue so we can check and assist you further. You can use a tool like https://imgbb.com/ to share the screenshots.
We really look forward to helping you.
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.