Merging Folder Contents
Kaleidoscope can help you merge the differences between folders you are comparing.
Note that Kaleidoscope does not automatically merge contents of folders. When you decide to copy a folder from A to B and a folder with the same name exists in B, the entire contents of that folder will be overwritten.
Choosing Items to Copy
Select an item then click Merge > Copy A to B (or Copy B to A)
Select an item then click the Copy A to B (or Copy B to A) button in the toolbar at the bottom of the window.
An arrow will appear in the center column to indicate the selected copy direction.
You can also interact with the arrows in the center column to assign copy direction or clear the selection.
Hover the mouse cursor in the center column next to a changed or unmatched item.
An arrow will appear indicating the copy direction options.
Click the arrow to set the copy action.
You can click the arrow again to toggle through the copy direction options or to clear the selection.

Green arrows indicate the unmatched files will be copied from the right to the left.
Red arrows indicate the unmatched files will be copied from the left to the right.
Blue arrows indicate the changed file will be copied in the selected direction.
Copying Files
Review your changes then click the Copy button in the lower right of the window to apply them.
Deleting Files
Kaleidoscope does not support deleting files from the folder comparison. To delete an item:
Control-click (or right-click) the item and choose Reveal in Finder.
A Finder window will open with the item selected which you can then delete.