Folder Popover is a window that displays contents of a folder. The window is displayed when: 1. You drag files / folders to the folder inside a Collection 2. You click / double click the folder (if "Show content" is defined as an action for folders in Settings -> Actions -> Item activation)
The popover displays content of the clicked folder or the folder content during drag and drop:
Actions which trigger the popover window can be defined on the Actions tab. The popover allows to browse folder hierarchy. Click on the title bar to show the current path navigator. To change the path select a folder in the navigator or double click on a folder inside the popover:
To adjust the popover colors and items size, make sure you have selected "Close manually" checkbox, then open the popover. Changing the colors or size of the elements will reflect the appearance of the popover live: