How to dock a window to an inside edge of a dual-monitor setup [duplicate]

Solution 1:

This behavior is by design.

On a dual monitor setup, the inside edges where the 2 monitors meet must be transparent for the 'snap' feature when dragging windows. If it were not transparent, you would not be able to drag anything from one monitor to the other monitor.

They thought that would be jarring experience. But you can do it with the keyboard:

Click whatever program you want to dock, then press Windows+Arrow (right or left).

Solution 2:

In addition to using the windows+arrow keys, I highly suggest trying out GridMove. It's a fantastic window management program if you have multiple monitors (or even one large one).