On the details fly-out, there is no possibility to change the appearance of the field Duration for attribute Duration on object Task.
Currently there is three decimal places but we would require 0 decimal places.
In 15.9.2 before upgrading to 16.0.3, the Duration field was displayed without decimals. The view options settings are the same as before the upgrade.
Release : 16.0.3
There was a redesign in 16.0, to have the fly-out details display the decimals configured for the number attributes as stored in the database.
The "view options" applies only to the Grid.
The fly-out details fields do not currently have a setting/view options to configure them.
If you are interested in having the possibility to control the view options on the fly-out details, please reach out to Product Management: