Problem/Motivation
When you are editing a default layout there is no way to know (besides your memory) which view mode the layout is for.
For example for articles the titles is always
Edit layout for Article content items
No matter which view mode is being configured
Proposed resolution
Add view mode to the title.
Edit [view_mode] layout for Article content items
Remaining tasks
Do it
User interface changes
View mode will be displayed
API changes
None
Data model changes
None