I'm having an issue with the editor's resolution. It's so tall that the button to load a save game to edit is covered by my taskbar. I could hide the bar, but that seems like a bandaid. I feel like that's something that may end up being an issue for others as well... Just seems odd, doesn't make much sense why it'd be like that to me, I guess...
The window can be resized by dragging the top or the bottom of the window frame. That being said, it is designed to detect the size of the desktop and resize itself if the default size is too large. If you are using a two-monitor setup with different resolutions it may be the case that it is not resizing because the larger monitor can accommodate it. If this is the case, I suggest resizing the window or moving it to the larger monitor.
Otherwise it should already work.
