I am currently fighting a level 13 Switzerland Single boss, and I recently realized that there are no multi-attack sliders available. Now, I'm pretty sure that the multi-attack option was available on the Mad Scientist Zombie I had fought prior to fighting this boss. Why not this one?
I'm playing using a web browser in a video game console, so I can't provide a screenshot, but there's no need. Everything is now as it should be.