If the user has sufficient permission, the portlet symbols will be displayed in the title bar when they move the mouse over the portlet.
You can stretch a portlet over multiple columns by dragging this symbol with the mouse.
The settings for the portlet can be changed here.
Minimize / Maximize porlet
The portlet will be reduced to the display of the title bar or be shown in it's full size.
Move portlet to pool
Removes the portlet from the portal page. It can be added to the page again at any time via the portal pages configuration