Normally, all visitors to your Authory page will see all your articles in chronological order. They can then select to see one of the Collections you have created.
However, you can also decide that visitors to your Authory page shouldn't see all your articles but a certain Collection instead by default.
To mark a Collection as your default Collection simply log in to your Authory account and then select "Collections" in the sidebar menu. Next you need to hover over your chosen Collection with your mouse. A number of icons will appear. Click the star icon to set this Collection to be your default Collection.