Dragging a window to one edge of the screen it would “dock” there and it will re-size to fill half the screen or full screen. some users might prefer to turn off the feature entirely and go back to resizing windows as they see fit.To Turn Off Automatic Window Resizing:
1. Click Start, Control panel, then click Ease of Access Center.
2. Scroll down and click Make the mouse easier to use.
3. Scroll down to and Checkmark: Prevent windows from being automatically arranged when moved to the edge of the screen.
4. Click OK and you’re done!
Now your windows won’t dock or re-size when you drag it to the edge of the screen.