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

Recent Posts Widget

1. Enable or Disable the widget.

2. Specify the Number of Posts you want to be displayed in the Recent 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 2 Cache.

 Magento 2 blog recent posts configuration

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

 Magento 2 blog recent posts