Accordion animation design. Can't seem to find a right triggers.

I am fairly new to the storyline, and I'm trying to create an accordion animation design inspired by the @Mark Spermon YouTube channel. I am having a bit of a problem animating it to move left to right or vice versa on a single slide. I tried playing around with the triggers, but to no avail. Can anyone kindly enlighten me with this knowledge on how I can fix the triggers?

Attached is the file I'm working on.