Settings such as the time frame are set on a tab by tab basis. So you will need to choose a time frame separately for each tab you are using e.g. Referrals, Contacts etc.
From the relevant tab within Task List:
Right click on ‘Assigned Tasks‘ (towards top left)
Click ‘Customise Patient View‘
Click the ‘Time Frame‘ tab (top left of the box)
Select ‘Generic Time Frame‘
Set the Date/Time range
Click ‘OK‘
Tasks for that Date/Time range will now show
Changes to the time frame will need to be re-set to ‘Defined Time Frame > 24 Hour Shift’ when no longer required or your most recently received tasks will not be displayed.