How to add Read More inside post?

Hi,

To clarify: Do you mean a "read more" button for single post's contents?

I believe this article may help you:
https://docs.generatepress.com/article/using-the-more-tag/

It's a block you can use on Gutenberg editor for posts contents when you edit your post.

Hi Elvin,

Tried that. But it only appears in Archives, not Posts.
When I click the Posts, it already shows all.

Hi there,

i am not sure why you would want to hide the content on the single post and force the user to click another button to read the content. But this would require custom development which is outside of the scope of this forum.

I read somewhere that by implementing that, it can reduce Bounce Rate. Is that true?

I have never heard that before. In my opinion forcing a user to click another button to read the content creates a poor UX is more likely to increase bounce rates.