The Samsung 28", 4K Monitor has a very nice display of MoI.

Aero Snap got turned off, somehow. Maybe the Samsung install software is to blame?
To restore Aero Snap, https://grok.lsu.edu/article.aspx?articleid=12755

Control Panel/ Ease of Access Center/ Change how your keyboard works/
Uncheck: Prevent windows from being automatically arranged when moved to the edge of the screen.
- Brian