Widgets »Categories Widget
The Categories Widget organizes your posts by category in your blog’s sidebar. This can be handy for readers who want to find more of your posts about certain topics.
Here’s what it looks like when it’s activated on a blog sidebar:
Note: Only categories that are attached to posts will be displayed in the widget.
To add the widget to your site, go to My Sites → Customize → Widgets. Click on the location you’d like to place the widget on your site (either a footer or sidebar location). Click on the Add a Widget button. Next, type “Categories” into the search bar and click on the Categories widget to add it to your site:
Title — Customize the title that displays above the categories in the sidebar. (For example, Categories, Subjects, Areas of Expertise.)
Show as dropdown — Check this box to display the categories in a drop down menu rather than as a list. This is handy if you want to save space or have a lot of categories.
Show post counts — If this box is checked, the total number of published posts for that particular category will be displayed next to the link. You can show post counts with both the list and dropdown menu formats.
Show hierarchy — If you have parent and child categories (subcategories within main categories) you can choose to display the hierarchy (pictured below) or just leave the list “flat,” without indicating which subcategories fit inside your main categories (pictured above). You can show category hierarchies with both the list and dropdown menu formats.
Changing Visibility is optional. It is an advanced option which allows you to choose when to show the entire category widget based on different factors.