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basic_concepts:the_lister:dual_display
Dual Display
The term dual-display mode refers to the display of two independent file displays in the one Lister. Each file display can show the contents of a different folder (and can have multiple tabs).
Dual-display mode makes it particularly easy to compare the contents of two folders, or copy or move files between two folders, without needing to open multiple windows or change folder a lot. Another common use is to display the same folder in both displays, in two different view modes - for example, details mode in one and thumbnails in the other.
Switching into dual-display mode
The easiest way to put a Lister into dual-display mode is with the buttons on the default toolbar:
switches to horizontal layout
switches to vertical layout
You can also press F6, which toggles between single-display and dual-display in whichever layout (horizontal or vertical) you last used.
When a Lister first goes into dual-display mode, the currently displayed folder will be duplicated in the new display by default. You can change this to always show a particular folder or tab group with the options on the File Displays / Options Preferences page.
Copying files in dual-display mode
When a Lister is in dual-display mode you can copy or move files from one display to the other using drag-and-drop or copy-and-paste.
Dual-display mode also ties in with the source and destination concept - whenever a Lister is in dual-display mode, one display is always designated the source folder and the other is the destination. This means that commands like Copy Files will always copy selected items from one display in the Lister to the other.
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