Understanding the Folder Merge Display
The Folder Merge display uses color cues to highlight the differences between the base folders. By default, the color meanings are:
Pick View > Legend to display a guide to the various folder icon color combinations.
To change the default colors, pick Tools > Options , switch to the Colors, Fonts > Folder Views page, and find the Merge colors settings.
You can temporarily hide the Center Pane to give the left and right panes more room.
Regardless of merge target:
When merging to left:
When merging to right:
When merging to other: