click on a folder → View tab
-> Select "Show as Conversations" -> In "Conversation Settings" -> select "Use Classic Indented View" -> In "Message Preview" -> select Off
The following should be checked when you right click on the message index pane
Date (Conversations) Show as Conversations Show in Groups
Select sorting so as to display new items at the bottom.
tags | sorting and grouping messages
To display the emails in the good old thread display
Tested on | Microsoft Office Professional Plus 2016
File -> Options -> Calendar -> Work time -> Work Hours -> set 'Start time:' to 12:00 AM -> Set 'End time:' to 11:30 PM -> Select all days in 'Work Week:' -> OK
Found the answer in | https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other-mso_2016/outlook-calendar-view-how-limit-hours-shown/7c0524d8-3b03-4bc4-ac23-e21c872d9bbc