In order to manage Blog Featured Posts in Magento 2 Blog, please go to the Admin Panel > Stores  > Configuration  > Magefan Extensions  > Blog > Sidebar and find Featured Posts Widget section.

Featured Posts Widget

1. Enable or Disable the widget.

2. Specify the Post IDs of the posts you want to be included in the Featured Posts.

3. Set the Sort Order to manage the position of the widget on the StorefrontThe higher the number of the position, the lower it will be displayed on the Sidebar.

Once you've finished don't forget to Save Config and Flush Magento Cache.

Magento 2 blog featured posts configuration

4. Check the blog Featured Posts out on the storefront.

Magento 2 blog featured posts