Previously, when committing changes this window with all changed files would appear as in the picture (this is not the default behavior now - to make it pop out as a separate windo, you need to make a change in the settings), and in this window with all the files, you could select any file you'd like to commit, and in the same window you'd see any diffs with the selected file.

Now if you want to see the diff, you need to click on selected file and open an entire diff tab outside of this scope. Is there a way to return to the previous behavior for this window?