It would be a nice add on feature if the toolchain was always displayed so that the top-left corner would represent the left most and up most point of the toolchain.

If possible, the zoom level should also be set so that all of the toolchain is visible on the currently available canvas.

Currently this is not the case so it may happen that you edit a toolchain to find what looks like an empty canvas, where actually the toolchain is somewhere in an invisible location.