On the left-hand side of the FileManager there is a nested Kendo UI TreeView component, listing all folders loaded in the FileManager. The TreeView allows dragging and dropping files inside it, or between the Grid and ListView. It also provides you the possibility to rename files or folders, as well as execute commands with the inbuilt ContextMenu.
The nested Kendo UI TreeView component is the standard component from the Kendo UI suite. This is why, all functionalities and features, such as Keyboard Support and Accessibility compliance, are inherited.
As for R1 2020, the Breadcrumb component is added to the Kendo UI suite and it is incorporated in the FileManager.