This should already happen, if (1) you have configured background fetching in the Preferences and (2) you have configured Always fetch new commits, tags and branches from submodules in the Repository settings.

I understand now. Unfortunately the submodule is a different repository and displaying such commits doesn't fit into the Journal at all. Also, a pull on your main repository won't bring these new submodule commits because the submodule-pointer (GITLINK) in the parent repository hasn't changed (otherwise you would see this commit in the Journal).

Is View|Cluster Commits by Branch option what you are looking for?

I don't exactly understand the description -- the Journal for LibraryA will already show new commits for LibraryA. Can you please review your description and/or give more details?

With our current framework this will be rather hard to do.

Will be present in version 17.1

We felt 10 is a reasonable value and it's not likely to be changed. You can still change it but not from the GUI but only using system properties: https://www.syntevo.com/doc/display/SG/System+Properties#SystemProperties-Journal

You may want to vote for https://smartgit.userecho.com/topics/256