In order to manage Blog Archive in Magento 2 Blog, please go to the Admin Panel > Stores > Configuration > Magefan Extensions > Blog > Sidebar and find Archive Widget section.
1. Enable or Disable the widget.
2. Set the Date Format you want the Archive to be arranged in. Note: that this option is available for Blog Plus users only.
3. Set the Sort Order to manage the position of the widget on the Storefront. The 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.
4. Check the blog Archive out on the storefront.