Hi There,
I hope you are well today and thanks for posting here.
Please see the solutions posted in the following topics for the similar issue.
https://colorlibsupport.com/t/more-link-not-visible/
https://colorlibsupport.com/t/difficulty-with-read-more-summary-at-the-end-of-a-new-post/
https://colorlibsupport.com/t/read-more-tag-doesent-work/
Best Regards,
Movin