The latest news widget provided by the theme has an option to individually control the excerpt length in the posts by providing the no. of words displayed in the widget settings and thus it ignores the more link added from the post editor.
However, if you wish to display the read more text only upto the more link in the editor, you can achieve the request with some code modifications. For this you will need to create a child theme.
For reference on child theme creation, you can see the links below :
You can also automate the process with the help of plugins like :
After creating and activating your child theme, add the following code in your child theme’s functions.php file :
This will override the excerpt length to the length set in editor by “more link”.
Also, please note that the code will take excerpt length from the more link, the no. of words set in widget settings will have no effect.
As the resolution needs some code handling, you can also choose to Hire a customizer to do the task for you along with your required modifications.
Hope this Helps,
Best Regards !!