You can add a "Read More Break" to your post in the content editor to show where this summary should end.
It allows you to specify where the summary break happens and provides a flavor of what the post is about. So, your readers can scan headlines and summaries more quickly and want to read more!
How to use the "Read More Break" in your posts?
Click More Misc in your content editor.
In the popped-up toolbar, you will see "Read More Break"
Place your cursor where the summary break happens and click "Read More Break," and that's all!
And let's see how it is seen in your widget;
