Git Changes:Log One project with many repositories

There never was filter by repository in the Log. Only by file/folder.
However, there are plans to impement it: http://youtrack.jetbrains.com/issue/IDEA-75093

in 12 version was this feature

Git Changes -> Log -> Date Order -> Repositories... -> Show Graph for:

I called it "filter on repository"

http://youtrack.jetbrains.com/issue/IDEA-75093 exactly what I need!

but I need it now in 13.0 not in 13.1

That one was filtering only the graph, not the list of commits, so I wouldn't consider that feature as very useful.
Sorry, you'll have to wait until 13.1.