By design, after the comparison is performed, JuxtAPPose will display only the rows we need to see and identify with colors the type:
Differences: Any cell with a different value juxtaposed in the opposite source (Cells highlighted on light Brown).
Unique keys: Rows that based on the Row ID can't be found in the juxtaposed source (Red).
Repeated keys: Rows that based on the Row ID are repeated, and therefore, can't be compared (Silver).
These colors are matched in the quick counts, clicking on the corresponding color for the type of difference you are interested will make the results to go to the beginning of those differences. Double clicking on any cell where there is a difference will sync the juxtaposed data set to select the cell that was compared.