Right click the taskbar and choose properties.
In the resultant dialog box under the Taskbar tab click
The customize button in the Notification area frame
Make sure the
"Always show all icons and notifications on the taskbar is deselect (unchecked)
Click OK
This should produce the small up arrow adjacent to the system tray area of the taskbar.
Alternately, after deselecting the checkbox you can define, using the individual drop down arrows how to display icons in the notification area (system tray).
Regards
Randy