I'm seeing this behavior and would love to turn it off. Sometimes (weirdly it's not consistent) if I drag a screen inside a split screen, even if it's far away from the monitor edge, DF wants to maximize it. In the video you see it with the split screen on the right, but sometimes it does this in BOTH splits, so I can't even place an open window down without maximizing it. Again, it's not consistent, sometimes it's one split, sometimes both.

My preferred behavior would be to only maximize if I dragged to a monitor edge. I can't see a setting to change this.

Awesome that worked perfectly, thanks !