Hi again
As to the fixed date.
I tested with my android MLO. I gues the iPhone/iPad versions behave the same.
1) if you create from scratch a view which shows completed tasks on android/iOS, the view will show all completed tasks.
2) instead, if you create the same view on windows MLO, you can fine tune the completed date depth.
Then to have it on mobile, you need only to export the view from windows mlo and import it to your mobile mlo.
(To export from windows do right click on view name and choose export views. save it on your dropbox/onedrive/google drive and open it on your phone.
or you can send the view to yourself by email.)
If you do this, you should see the same completed depth on the mobile MLO platform too.
br
Andrew