There are so many possibilities, I don’t know where to start! It would depend on how flexible the design can be.
I’d like my frequently used accounts (starred maybe?) on tab one - the current accounts and credit cards I use on a near-daily or daily basis. Then I’d have tabs for actively used current/credit and inactive, but need to be monitored.
I’d also like to be able to split savings into short term, medium term and long term and aggregate/group savings accounts, so I can see a single figure eg for how much I have saved at Halifax (I don’t care too much about the specific accounts I have - I have at least four now with Halifax, whereas I do want to see the total I have with them).
I’d split the Investments tab into meaningful categories, such as “highly speculative/basically gambling”, to P2P, to balanced portfolios and “very boring pension”. Clumping it all together under Investments doesn’t give you much of an overview.
On the loans tab, I have quite a few manual accounts, which I use to subtract certain future spending and keep a log of the tax I’ve paid and upcoming payments (which I treat as debt for the purpose of my running net worth). I would split this up into work/non-work as a start.
I’d create a tab for my misc manual accounts. I find it easier in some cases to exclude a transaction in a real account and create a load of manual transactions for Analysis instead. This works well for Amazon, for example. I also have a manual account for whenever I pay for something and someone part pays me. Exclude the real transactions and create a single transaction for what you paid - much neater!
Of course, not everyone is quite so particular