How to change author’s displayed name

Thanks @rakxzo for using our theme.

Regarding your queries, Currently, this feature is not available, We’ll update it in next version.

Hope, you’ll understand.

Understood, can you share a snippet to add to the functions file to display the nickname that the authors has picked please?

Thank you.

Looks like a defect.
Why on earth display username in the first place?

I also wanted to know about this that why does you display username? The name which author select should be displayed not the username. I have now created new author with the username which I can display on my posts, and changed all posts’ author to that new one, as described in the below source.

source: https://www.webxen.com/kb/how-to-change-author-in-wordpress-post/