I know that full duplicate search between two folders is not supported, but what I want is somewhat different. I want the program to show me not the duplicates but file differences, i.e. the files that exist in right panel but not left, and vice versa. None of the duplicate searchers apps can do this, except WinMerge. Take a look at the screenshot to get the understanding how it looks like: each line has uniqueness attribute on the right column that shows either the file/folder exits only on the right, or on the left, or both. Pay attention that it works recursively.
I tried to achieve the same behavior with your folder comparison feature but failed to do so. It only shows file inside the folder, but doesn't go deeper. Is there a way to achieve the same comparison view like on my screenshot?