Each diff block has a diff bar showing its boundaries. The color of diff bars corresponds to the type of diff block. Unless otherwise stated, each type of diff block is only shown during file comparison.
In text file merging pink background color denotes conflict blocks (shown as the last image at right), and green background color - manually resolved conflicts or other differences.
Clicking on a diff bar selects the diff block. Right-clicking on a diff bar brings up a context menu. Information about its options can be found here.
Each diff bar (except for resolved diffs) contains a synchronization button. Clicking the button in file comparison replaces the opposite diff block with the chosen diff block. Note that this operation is disabled if the files are out-of-sync due to manual addition or deletion of lines in either file, or if editing is disabled for any other reason.
Clicking a synchronization button in directory comparison copies the items from the chosen diff block to the opposite diff block. (Just like in file comparison, copying an empty block is equivalent to deleting the opposite block's contents.) Note that this operation is disabled if the directories are desynchronized due to scrolling.
In text file merging synchronization buttons are represented by arrows or circles. Clicking on a button, depending on whether the diff bar belongs to the left, center, or right pane, executes Use Left (Theirs), Use Center (Base), Use Right (Yours) commands respectively. Blue circles with checkmarks represent blocks that have been chosen during merging, either automatically by the merge algorithm or manually.
The tooltip for each diff bar displays information about the difference. This information is also visible in the diff combobox under the toolbar.