I have a PSD with a mobile and Desktop artboard in it, working in the latest version of Photoshop CC.
I'm trying to make slices out of layers, but one layer in particular runs off the canvas, so I'm trying to just clip the layer by CTRL+selecting it, then with the rectangular selection tool and holding ALT I drag a box off canvas to begin removing the off-canvas sections of the rectangular layer.
However, I can only get the rectangle select tool to work if I place my cursor directly over the canvas, or between the two artboards. If I try this anywhere outside of the canvas that isn't directly between the two artboards it fails.
Why is this?