Just press the green flag! And thank you Getting Unstuck 2020! This has been a wonderful learning experience.
I wanted to redo my project #03 so that when the butterfly touches a flower (touches the color), the background stops scrolling and the butterfly stays there for a bit, then everything starts up again. I have the scrolling starting and stopping, but the problem is the butterfly stops when its body is not really ON a flower. I guess "touching sprite" means even if the edge touches the edge of the other sprite. This means I really need to check for the center of the butterfly touching a flower...more complicated. I also used a timer (which I had never used), so the butterfly wouldn't be stopping too frequently. Credits: Scratch sprites, the drawing is mine, and the scrolling "background" code is thanks to @mstone326 for the original project "scrolling pictures FB Help".