Wandsworth Libraries

I assumed with this update a feature to save your account details and anyone linked to your account (I.e. your Children’s accounts) would be added so that you don’t have to go and find card details to change accounts each time. Maybe I’m not looking hard enough but I can’t find this. Surely simple to do. Really annoying. Please can someone tell me how to do this or make the change to the app so that it is possible? Otherwise a decent app. But stars knocked off for this.