Time for action — splitting Blender windows
Now you will make new Blender windows. Unlike other systems, you are not limited to a set number of windows or a set layout:
Look at any of the windows; you will see three diagonal lines in the lower-left and upper-right corners of the window, as shown in the following screenshot. These control the creation and deletion of the window.
Put the cursor over the largest window and move the mouse over the diagonal lines at the lower-left corner of that window. Then, hold down the left mouse button (LMB) as you move the mouse horizontally toward the center of the window and release the left mouse button (LMB) when you have moved the window edge to replace one third of the old window.
Put the cursor over the center window that you just made. Move the mouse to the diagonal lines at the upper-right corner of that window. Then hold down the left mouse button (LMB), while you move the mouse horizontally toward the center of the window. Replace another one-third...