On this window you can:

• Expand/Collapse a single node: to expand/collapse a single node, click on the triangle at the left of the row.
  
• Expand/Collapse a whole three node: to expand/collaps a node and all its folders nested, hold down the ALT key and click on the triangle.
  
• Get further information on a certain item clicking on its row (source or destination column). The information for that item will be shown at the top of the window.
  
• Inspect the content of the selected files clicking on the icon
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• Tell the Finder to reveal the selected folder or file clicking on a row (source or destination column) holding down the CONTROL key or clicking on the icon
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• Exclude an item from being copied/replaced/deleted clicking on the icon of the central column.
• If both the source and destination files exist, and if the task is a sync, you can change the copy direction from left-right to right-left and viceversa. In order to do that, you have to click on the central column icon holding down the ALT key.

The central column with icons shows the way each item will be treated:

•  Existing: the existing folders containing items to be copied or replaced or deleted are listed here with the “existing” icon just to show where those items are located.
  
  
•  Violet Arrow: the violet arrow icon means the item will be copied from the left folder to the right folder. If the right item already exists (thus the color of its name is black), it will be replaced.
  
  
•  Orange Arrow: the orange arrow icon means the item will be copied from the right folder to the left folder. If the left item already exists (thus the color of its name is black), it will be replaced (see the file Meetings.rtf selected in the list).
  
  
•  Trash: the trash icon means that the item will be deleted. This could happen only if you marked the check-box “Exact” in the Settings panel and occurs when an item exists but its specular item doesn't exist anymore.
  
  
•  Skip: you can force FoldersSynchronizer to exclude (skip) an item from being copied or replaced or deleted, clicking on the icon in the central column. The current icon will be switched to the “Skip” icon and the color of the items’ names will be turned red (see the item "ReadMe.rtf" in the picture aside). To re-include the item, click again on the skip icon.
  If you skip a folder, all the nested items will be skipped too.
  If you skip a “to be deleted” item, nested within a “to be deleted” folder, FS will mark that folders as “to be skipped” too.
  
  

• You can abort the whole sync/backup task pressing the button “Stop”.
• Instead, press the button “Continue” to let FS execute the sync/backup.

• The PDF User manual contains more detailed information.