In our premium theme, you can give the size of except length individually on each widget. For example if you are using AT Post Column widget, you can set the words length. In case of Blog/Archive page please follow this documentation to know how to set Words length on that page. https://doc.acmethemes.com/supermagpro/#HowtomanagetheBlog/ArchiveLayout?
If you feel any confusion, please write us, we will help you with our best.