Thats's actually pretty easy -- you have to explicitly create a collection named all (so that it's handle will be all). This new collection will be shown instead of the default all.
Then you can set a sort order on this collection.
Great. that's what i was looking for. I changed also the name after creating the collection and it still is recognized like "all".
I set it up to "auto" and condition to "price major than €0" so it gets all product which price is bigger than €0
My question would be in regards to the same topic:
If creating a separate collection with URL handle "/all", then the issue for me is that it creates a separate collection and that means a customer does not have a filter option any longer on the main products page as previously. The default products page offers filter by tags function which helps people to look into specific categories of products. I want to make sure that a customer could filter the products on the main default products page by either collection or by product tags as per default. What would you suggest to do after creating a new collection "/all" to enable a filtering option for customers or a collections selection option.
For reference, this is the current default products page: https://beebaltic.com/collections/all