Mobile App: 

• Click on “Collections”  on the bottom bar of the screen.
• Click on the Collections icon at the top left corner of the screen.
• Long press your desired collection from the list to view additional options.
• Click on the Pin icon (First on the right). 
• The collection has been marked as default and all saved articles by default will be saved in this collection, unless assigned otherwise.

Web App:

• Click on “Collections” on the menu to expand the collection list.
• Find the collection you want to set as default from the list and click on the Pin icon that appears by its side.
• The collection has been marked as default and all saved articles by default will be saved in this collection, unless assigned otherwise. 

Note: Use the same procedure to unmark a default collection. Marking a second collection as default, automatically unmarks the first.