The Merge section of the ribbon provides buttons to help you copy from one file or folder to another:
•Right (Ctrl+Right)
Copies the current selection from the left to the right file or folder.
•Left (Ctrl+Left)
Copies the current selection from the right to the left file or folder.
•Right, Next Diff
Copies the current selection from the left to the right and advances to the next difference.
•Left, Next Diff
Copies the current selection from the right to the left and advances to the next difference.
•All Right
Copies all differences from the left to the right file or folder.
•All Left
Copies all differences from the right to the left file or folder.
See also:
Navigating Between Differences