Windows 10

MacOS

To snap windows to a side or corner via mouse: You should see the visual cue of a small, expanding blue ring emanating out from your cursor when you’ve hit the correct spot for Windows to sense your attempt to snap the window in question to a side or corner. This is your cue to let go of your mouse button.  To Snap windows to a side or corner via keyboard:  Once you’ve got the two windows of your choice ready, you can also click and drag on the center bar to vary the amount of screen each is allowed to take up. How wide or narrow a window can get will be determined by MacOS and its parameters for the apps being used.