Hey!
I am doing well, thank you - hope you are too!
On the hobbies question, it is absolutely fine to focus primarily on your non-academic interests. If you have already covered the "positions of responsibility" clearly elsewhere in the application, I don't think it is necessary to repeat it in detail here. However, what you can do, if relevant, is briefly weave in responsibility within your hobbies (e.g. organising events, captaining a team, etc.) without turning the answer into a duplicate of other sections. The key is to show your personality and what you do outside of academics, and firms often use this question to see if you're well-rounded and how you might fit culturally.
On the experiences section, you are right that this structure seems a bit unusual, but I would treat them as serving two different purposes in your application:
1. Work Experience Section: this is broader and more formal, so I would include your main roles (legal and non-legal), especially anything that is substantial
2. Additional Experience Section: this is more supplementary and law-focused, so I would include things such as insight days, mooting, pro-bono activities, society involvement, short schemes, etc.
I wouldn't move all legal experience into the additional experience section, as you risk underselling more substantial roles. There can be some duplication across the two, I would just make sure that the additional section focuses on anything that shows how you have strengthened your interest in law that isn't necessarily formal employment
