Side by side. You can turn Instant preview off for faster display. Expert Mode and Basic Mode Toggle between 2 modes. Expert mode features the full power of 1-4a rename. So you see immediately which files stay the same and which would be renamed.
All functions are available immediately.
Additionally descriptions pop-up as soon as you point your mouse over the functions. Colorful display Groups of similar functions differ in color. Functions which are disabled differ in color also. If filenames are too long, you would have to scroll. Additionally the columns are fully resizable .