Hi reepjyoti,
First of all I will suggest you to always create a new thread for new issues in the forum, it helps us to keep the problem and solutions exclusive and helps users with related issues.
Now to answer your question. The theme has hooked into a filter to change the excerpt length, which is now 40 words (default is 55), which means the number of words to appear before the “continue reading” link appears.
If you insert the read more link anywhere less than 40 words in the WYSIWYG editor, then that would reflect in the front end.
To increase the excerpt length, you can use the following codes in your child theme‘s functions.php file.
remove_filter( 'excerpt_length', 'athemes_excerpt_length' );
function se_excerpt_length( $length ) {
return 100;
}
add_filter( 'excerpt_length', 'se_excerpt_length' );
The example above will increase the excerpt length to 100, you can adjust it as per your need.
Hope it helps!
Thanks