Click the flag!!! Click the button on left if you want to turn on/off ticking. For the strike on the hour, same on the right. You cannot turn the striking off when the clock is striking.
Inspired by Colonial. I didn't know why my Colonial was gone for a while, I found out she was getting refurbed! The confusing Brass Wall Clock with Keyholes AND Chain has come back from a refurb, too: https://scratch.mit.edu/projects/651585649