Mark section as done when saved with a green tick glyph icon

[shakram02]

If a section is saved, put a check mark on its top, if it's then changed ( using ngOnChanges ) remove the tick mark, to notify the user

example, I'm now editing the shifts section, I hit Save Shifts then I see a check mark
If I edit the shifts after that, we set the visibility of the check mark to false by a flag in ngOnChanges

Recommendation:The check mark should be shown in the tab title