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The Difference Menu

Difference → Unapply All (Ctrl+U)

Unapply all differences previously applied between source and destination.

Difference → Unapply Difference (Backspace)

Revert a selected difference previously applied.

Difference → Apply Difference (Space)

Apply a selected difference.

Difference → Apply All (Ctrl+A)

Apply all differences between source and destination.

Difference → Previous File (Ctrl+PgUp)

Make the previous difference, in the list of differences, the current file in the view pane.

Difference → Next File (Ctrl+PgDown)

Make the next difference, in the list of differences, the current file in the view pane.

Difference → Previous Difference (Ctrl+Up)

Select the difference above the currently selected difference.

Difference → Next Difference (Ctrl+Down)

Select the difference below the currently selected difference.