It annoys me that there is an invisible rectangular border to the play area. The flowing background colors suggest the play area is the browser window but not s

It annoys me that there is an invisible rectangular border to the play area. The flowing background colors suggest the play area is the browser window but not so. I could do with more stretch room. Also (Chrome on MacOS) if you drag a node to the border and it stops, the node is now stuck to the mouse and you have to click to drop it.