Q: iOS 10 - How to group notifications by app?

You are right. The new Notification Center makes our life so difficult and wastes our time 

Please Apple return back the old feature "sort by apps".

Yeah, the new notification center is awful.

I"m using it on an iPad, not an iPhone (don't trust it on my iPhone yet).

1) No clear indication of which part of notification center you're in (just two very easy to miss dots at the bottom of the screen).

2) the notification center widget "edit" mentions left column vs right column, but this has absolutely no apparently meaning.  If you're in notification center and rotate the screen to landscape, column do not form.  It also doesn't have any relevance to left (widget) screen vs right (notifications) screen.the

3) the "group by app" in settings isn't there anymore (nor the "sort order").  Which are SORELY missed.

4) to scroll through widgets, you have to touch the widgets, you can't put your finger into the margin to scroll.  Which, because IOS is so horrible about detecting grab vs click, is prone to activating the widget instead of bypassing it.

So far, the rest of IOS 10 is just "slightly different".  But Notification center?  HORRIBLE. 

Yes Apple please bring back group by app options in notifications.

Having the same struggle. Doesn't seem to be an option as of right now.

I totally agree, I dont really understand why the option to sort by App is missing but I love if Apple put it back

You can submit your feedback to Apple here:

http://www.apple.com/feedback

PLEASE bring this feature back!  Change is fine but this change is sorely missed. 

Johnkzin:  The left/right function works when you have your iPad rotated into landscape mode.  But only when you swipe right, not on the "home" notification screen.

braing30: unless you're using an app that doesn't allow landscape mode (like if you invoke notification center from the home page / finder-equivalent).  In that situation, notification center doesn't change orientation.  I noticed that later, after I had posted my previous comment.

I actually called support and yes this is no longer an offered feature with the new ios and in order to get this feature back everyone needs to go to apple.com/feedback and report that you would like it back and with the next update they may do that if enough people request it.

I see someone already provide the link before I posted but yes everyone please report.

Please bring this back. It was the best way for me to stay organized.  Not everyone's brain works by date only.

Just want to say ditto - please Apple put the ability to group by app back in the settings. Annoying for something used so often to not have that option.