We'll create fresh WordPress site with Page on widget installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Show content of any selected page in a widget.
In the back office, on your post page, check the checkbox “Add this page on widget”.
This selected page, appears finaly in your “Page on widget” widget.
Drag and drop your widget on widget-zone like you want.
Show or unshow the page title
Limit content lenght with number of words.
Custom the read more link.
Widget options: show or not page title || limit words of content || “read more link” custom