Winmerge - Way to make identical lines not to be shown when compare 2 files?

EDIT: My answer is not correct anymore. See answer blow.

OLD ANSER:

From the winmerge FAQ:

4.6. Can I hide similar lines in a file comparison, so that only different lines are visible?

No, you can't. Many users have requested this feature but we don't have any plans to implement it. We don't believe it would really improve usability.

In version 2.16 you can go to menu View - Diff Context and select 0 lines. This will only make visible the different lines in 2 files, and hide the rest.