I loaded a small sprite as background and it is shown in the top-left corner.

How can i move the range in the editor so i can see my particles spawning on the sprite? i tried everything… left click, left drag, middle-drag, right-drag - inside the range, at the corners, with shift and alt and ctrl… i could not figure out how to move the range.

any hints?

You can do the following:

Middle clicking on canvas will move the emitter
Right clicking on canvas will move the camera and allow you to move to different area's