Sidebar functionality "expandAll" doesn't work but only shows the last folder's title.

[angeloyeo]

I uncommented line 50 to 53 in "_includes > sidebar.html" in order to use "Collapse All" and "Expand All" feature. However, "Collapse All" works but "Expand All" doesn't.

When I click "Expand All" it opens all the subfolders and closes. In the end, it opens the last subfolder and keep it open.

Anybody have had the same issue and know how to fix this?