Group by Date is not available!

On the Discover page of Lotus Notes 9.0 I see an option to categorize my mail by when it arrived—today, yesterday, or by date.by choosing Show > Group by Date, however when I click on show I do not see the option “Group by Date”. Can anybody give me solution for this issue?

IBM Notes 9
Social Edition
Revision 20130309.0942 (Release 9.0)

Subject: Idem

as from Help :

See messages in Inbox grouped by date From the Inbox, click Show → Group by Date.
Show or hide beginning of message in Inbox Preview message text in your Inbox view. From the Inbox, select Show → Beginning of Message to display message body text. Hover over messages in your Inbox to see the first 100 characters.

Neither are present in my mail file : StdR9Mail 9.0.1 (24/09/2013).

Notes client is full standard (Admin+Designer).
NB : access is Local.

???

Jean-Pierre

Subject: Mail File Design?

Your mail file should be upgraded to the mail9.ntf mail template.

Subject: Group by Date is not available!

The mail file was updated to mail9.ntf mail template and I’m still not able to see that option.