Follow-up to bug 159120: I suggest to add a command to toggle ShowCurrentModuleOnly in the MRU menu labelled "[x] Current module only" or "[x] Only %1 documents" with a replacement to the current module.
Provide the UI alternative to toggle of the expert configuration stanza ShowCurrentModuleOnly
As I exposed in the related bug, I think having the option selectable in the Recent Documents dropdown, or in the icon dropdown to open files, could be most visible for the users, without need to search for it.