Yes, you can set any collection as default. That way all your saved articles will be directly stored in that collection.

This is how you can do that:

Mobile:
  • Go to the “Collections” section.
  • Click on the  ( Hamburger ) icon at the top left of the screen. The entire list of collections will appear.
  • Long press on a collection. Few options appear on its right.
  • Click on the  ( Tick ) option. 
  • The collection will be marked as default.
Web:
  • Click on “Collections”. The entire list of collections expands.
  • Click on the ( Ellipsis ) by each collection. A menu pops up.
  • Click on “Mark as Default”.
  • The collection will be marked as default.