Time for action — maximizing and tiling the window
Blender lets you maximize and tile the windows:
Select the Header again with the right mouse button (RMB). The menu also has a selection for Maximize Area. Select Maximize Area with the left mouse button (LMB) now. There's only one window! Don't worry. The others are not gone. The window you maximized is just given the full display.
Click the right mouse button (RMB) on the Header again; the bottom selection will say Tile Area, and clicking on it with the left mouse button (LMB) will show all of the windows again.
What just happened?
Blender gives you a lot of flexibility. If you need to, it allows any window to use the entire screen and you can quickly change it back to tiled windows when you are done. This is great when you need an extra big view of the 3D View window to select tiny parts or details.
