It is not transparent what influences the categorization of payments into different categories.
When changing the category of a payment I can only select "Only this" and "All similar".
This should be extended to a more sophisticated menu to create certain rules.
I'm thinking of options like: "If card == Main and Payment in $GroceryStore then assign category: Groceries".
This should provide certain criteria like location or Name of shop or card etc. and then some actions like assign category, automatically request money, automatically split...
If I go out for lunch every week with colleagues or sth. and eat at the same place and always split by 3, I don't want to do it manually every time. And I don't want to control if the sandwich I bought in the morning at the same bakery every time gets sorted into Food and Drink (It is not at the moment sometimes™).
Also, it is not clear whether "All similar payments" affects past payments or just future payments.