Show read more in page

Hi Hòa

Thanks for reaching out.

Unfortunately, the core WordPress read more function is only intended for posts and not pages.

If you’d like to show and hide content using a toggle switch then you might look at using a plugin like https://wordpress.org/plugins/wp-showhide/.

You could also use a plugin like https://wordpress.org/plugins/whistles/

Hope that helps 🙂 Let us know how it goes.