The window will resume its previous position on the screen. Left-click this box to make the current window take up the whole screen. Left-click again to return the window to the previous size. You can drag the edge of a window to resize it in one direction at once. Drag a scroll bar up and down, and the objects in the window will scroll as well.
Some scroll bars have arrows on the ends.
Click these arrows to move the viewable area of the window in the direction the arrow points. If you'd like more information, try our more detailed description of X window parts.