Seems very buggy. I wasn't able to figure out how to drag a box to select multi objects. Tried Alt-drag, and it resized in a weird way I wasn't able to control

Seems very buggy. I wasn't able to figure out how to drag a box to select multi objects. Tried Alt-drag, and it resized in a weird way I wasn't able to control very well, and then the canvas was stuck to the mouse pointer with no way of letting go of it.