Adding a Collapsing Categories List to the Sidebar Helps Visitors Navigate Your Website
The “Collapsing Categories” plugin adds a list of categories and when a visitor clicks on the arrow next to a category a list of the posts in that category show in a drop down list.
See video tutorial below article.
To add the plugin go to your dashboard to plugins and to Add New. In the search box type in “Collapsing Categories” when it pops up click to install and to activate it.
Then go to your Widgets page in the dashboard because adding the Plugin creates a new available widget. The Collapsing Categories widget will be in there and you can click on it and drag it to the Sidebar area to add it to your website. Click Save.
When you check the front of your website now you’ll see a list of categories that opens to lists of posts when a category or it’s arrow is clicked.