Accordion Expand/ Collapse All button

I am having an issue with current code for expand/ collapse all accordion. Currently the code I attached only expands all accordions, but I need them to collapse all as well. Does anybody know what is wrong with this code and how I can fix the collapse all button.

This is the page where you can see the expand all button working but not the collapse all button: https://odpprevddemo.wesdemo.com/funding/how-apply-funding