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.

Archive Widget

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 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 archive configuration

4.  Check the blog Archive out on the storefront.

magento 2 blog archive