For moving things around across monitors & snipping them to specific half of desktop I personally use Winkey+[shift]+arrows shortcuts, I recommend you check it

For moving things around across monitors & snipping them to specific half of desktop I personally use Winkey+[shift]+arrows shortcuts, I recommend you check it out if you haven't already! I honestly don't remember when was the last time I needed a window with custom size. Maybe when placing 2 windows side by side? But even then, the OS recognizes that I want to see 2 windows at the same time and adjust sizes of both windows...