Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience caused.
Please ensure that you’ve enabled the “Open External Links in New Tab/Window” option under Rank Math > General Settings > Links.

Please note that we open only those external links in a new tab/window that are added from within the post editor window. For example, the external links in the header/footer section of the website would not be affected by this option.
Looking forward to hearing back from you.
Thank you
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.