Folder Columns and Navigation Pane
The folder tree is displayed as a series of columns. A single click on any folder in a column opens that folder in a new column to its right. Columns that behave like this are known as Miller columns, in which all of the columns that are part of the tree branches leading to the currently-open folder remain visible. This makes it easier to see where the currently-open folder sits in the folder tree structure, and to navigate to other branches in the tree.
One Commander adds two features to standard Miller columns to make it easier to work with folder displays in which a lot of folder columns are visible (when you're working with a folder that is a long way from the drive root):
- As each new folder is opened, the columns to its left shrink to give room for the contents of the current folder to be easily read.
- As the cursor moves over folders to the left of the current folder (i.e. over its parent folders), the folders under the cursor expand while the cursor is over them so their contents can be seen. The responsiveness and speed of this expansion, as well as many other features of the column display, can be adjusted in Settings > Columns.
Navigating through the columns
- Navigating to folder in column:
- if cursor is in a parent folder column: click on folder
- if cursor is in Current Folder Column in the Columns Layout: double-click on folder (this setting can be changed to a single click at Settings > Other > Opening items.
- Navigating through Parent Folder Columns: Left and Right cursor keys walk left and right through the path of parent folder columns.
- Move to parent of currently-selected folder: Click
(above file/folder name column), press Backspace, or click Alt+Up to move to parent of the current folder - Undo most recent backspace: Enter.
- Add Folder or File to selection: Ctrl+Select (with mouse cursor) in the Parent Folder Column in Columns Layout adds that folder or file to the selection and makes that path current.
Path history
Moving back and foward through the history of a path: Click 
(above file/folder name column), press Alt+Left/Right cursor keys, or 4th/5th mouse buttons. Note that if a tab was created from a Favorite, there won't be any history for that tab to move back and forth within until you have actually moved back and forth along that path, so until you do this the Alt+Left/Right cursor keys or the 4th/5th mouse buttons won't do anything.
Backlinks:
2. Quick introductory guide:3. The Browsers and Layouts
2. Quick introductory guide:4. Folder columns
3. Full reference guide:Browser Tabs
3. Full reference guide:Folder Pane
3. Full reference guide:Settings:Columns