Not sure if this is what you are looking for, but there is an option for expandable folders. This opens up another column when you click on a folder to allowing you to see the contents.You can access this setting by clicking on Settings---Configure Dolphin----View Modes----Details---and check the box for expandable folders. Within Dolphin Preferences Arrangement of icons can be changed from columns to rows. or to have it always open up as split screen.