Grid list layout

yes of course, to display the list of favorite posts with grid, you have to edit css class called ( .favorites-list li ) in the file ( favorites.css ) in the directory (wp-content/plugins/favorites/assets/css/) you will set the width and float, like:

.favorites-list li {
zoom: 1;
border-top: 1px solid rgba(0,0,0,0.2);
padding: .75em 0;
margin: 0;
width: 20%;
float: left;
}

As mentioned above, this will be handled in your CSS.

You’ll want to add the styles in your theme though… updating the plugin will overwrite any changes made to core plugin files.