Total Commander

"Compare left & right" in "Syncronize directories" do only work on a single pair of files.

Example:
Directory "A" consist 3 files.
a.txt
b.txt
c.txt

Directory "B" consist 3 files.
a.txt
b.txt
c.txt

When clicking "Compare" for directiory "A" and "B" a list of the result of the comparison is shown. Lets say that all 3 files differs, the red "Unequal files" icon will apear between all 3 files.
When selecting all 3 pairs of files (combine CTRL and left mouse button) and right click with mouse and select "Compare left & right". Only one of the pairs are compared.

What I suggest is that the comparing will work on alle 3 pairs.
So in this example "a.txt" files will be compared first. And when closing the "a.txt" compare window the "b.txt" compare window will apear. And when closing the "b.txt" compare window the "c.txt" compare window will apear.

By doing that the process of comparing many files will be more simple.

Regards,
Thomas

Comparison works only for focused line, not for selected.
You may use just mouse doubleclick onto a line to compare pair of files. It is quite easy to use.

I think it would be better to display compare results in list - e.g. to show '=' sign if files are identical (e.g. while comparing modern archives - TC can't compare them by contents).

No reason why the right click compare couldn't work on Selected files, Perhaps a single PopUp confirmation box to confirm you want to compare them all, and just open them in reverse order all at once --- so the first one is the topMost Compare.
If a script can do it, it'd be easy to implement - just a matter of convincing Mr.Ghisler.

It is bad idea to open them all at once - if files are large, it will eat very much memory and disk bandwidth.