According to administraton guide you have to select Showscanprogress
or Show scan progress if risk detected for using scan/snooze option.From pge no 435 of admin guide” To configure scan progress options for
administrator-defined scans
1
On the Antivirus and Antispyware Policy page, click Administrator-defined
Scans.
2
On the Advanced tab, under Scan Progress Options, click Showscanprogress
or Show scan progress if risk detected.
3
To automatically close the scan progress indicator after the
scan completes,
check Close the scan progress window when done.
4
Check Allow user to stop scan.
5
Click Pause Options.
6
In the Scan Pause Options dialog box, do any of the following actions:
■ To limit the time
that a user may pause a scan, check Limit
the time the
scan may be paused, and then type a
number of minutes. The range is 3
to 180.
■ To limit the
number of times a user may delay (or snooze) a scan, in the
Maximum
number of snooze opportunities box, type a number between
1 and 8.
■ By default, a
user can delay a scan for 1 hour. To change this limit to 3
hours,
check Allow users to snooze the scan for 3
hours.
7 Click OK.”