Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
I have just tested this on my end by entering external links to the main content of my posts and this feature works as expected.
Would you mind sharing a copy of one of the affected pages so that we can advise further?
We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WP logins in the designated Sensitive Data section.
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:
The problem has been solved friends.
1 – I took the urls I would like Nofollow.
2 – Unchecked the Nofollow External Links option.
3 – I saved the settings.
4 – I put the urls I would like Nofollow.
5 – I checked the option Nofollow External Links.
6 – I saved the settings.
7 – ALL RIGHT.