My taskbar has disappeared?

How do I reduce expand taskbar my arrow has disappeared from taskbar?

• I used to have an arrow which was used for reduction/expansion of the taskbar its diappeared how do I reinstall it

• Answer:

  sometimes if that arrow disappears that means that all the processes in your taskbar are active. That expand/reduce arrow in the taskbar is just for hiding inactive processes. Check your settings by right clicking on your taskbar and clicking properties and check "hide inactive icons" and/or clicking "customize".