This is used for dynamic content, so Posts, Pages, etc.
When you add to the page you need to create a template for it (you do that following its prompt)
Any items you place in the template need to be dynamic. So featured image, post title, etc. Or normal widgets see to use a dynamic source.
Anything you place that isn’t dynamic will be displayed the same in each grid item.
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.