Problem/Motivation
If you
- Manage layout on /admin/structure/types/manage/article/display-layout/default
- Save/Cancel layout
- Will be redirected to admin/structure/types/manage/article/display/default
- Click "Back to site" in the toolbar
- This is will take you back to /admin/structure/types/manage/article/display-layout/default😦
This probably because this was the last page you were on using the "default" theme.
You should actually go back to the last page were on before you start admin tasks.
Proposed resolution
Fix it.