Resetting the Slide

Hello everyone,

i need a Trigger to reset the Slide with the all other Triggers/ Functions.
I made a Course, i have a D&D Exercise, after completing this Exercise, if i use the side navigation and go to another page and come back, my drag items are back and everything look normal resetted. But when i do my first attempt, it gives me the first solution.

So basically, Storyline only resets the items not the Progress of that one Page (if i need to reset it). (resets to initial state on the settings is not working in that case).

What i need is a Trigger;
-Reset the Progress on this page, when the timeline starts 

thanks,

Arda