In history view, source tree displays the diff for only one file per commit.

[seongkwang]

 In history view, sourcetree displays the diff for only one file per commit even though multiple files have modified. How can I see all the files which have modified? The version of sourcetree is 2.4

[yoinamira]

It's hidden between sort-search bar and commit description panel.
It has 0 length so you have to unwind it manually yourself. 

That was the problem in my case. 

[Seth]

Under the graph, the left panel should display a list of modified files, and the right panel should display the changes within one of those files. Is this different than what you're seeing?

[Arun Das]

I noticed if I select all the files in the list, it will show a combined diff of all files. How can I just make it show the diff of all files by default? That's my preferred view. I don't want to have to click files one by one or have to "select all" the files manually whenever I view a commit.

[Arun Das]

LOL I just found out the answer to my own question. Just enable this option:

Sourcetree Settings > Commit > Select all files when selecting commit

[seongkwang]

There is a single panel under the graph. no panel displaying a list of files.