Thanks for contacting us and sorry for the inconvenience caused.
Our plugin generates the URL-prefix property as it doesn’t completely support the domain properties. That must be the reason you have two properties in your GSC account.
You can keep both properties as having two properties isn’t going to cause any issues. However, if you still want to remove one property, please remove the domain property(that doesn’t have a prefix like HTTPS or WWW) from your GSC account and keep the new property connected with our plugin in WP Dashboard > Rank Math > General Settings > Analytics.
Hope that helps. Let us know if you need any other assistance.
Thanks for Response
But We don’t know how to permanently remove domain property, even we remove this, It verify itself without using GSC verification code.
Once you have already connected your website to your Google account, it should not be added as you are already using the prefix method.
On your Google Search Console account, click the settings and then the Remove Property button
Hope that helps.