If I collapse the rows in the transactions table and make a change or just navigate to next page, the rows expand again.
I suggest to remember my toggle choice (at least until I leave the transactions view).
If I make a change (e. g. classify a transaction), I loose track of my edit position as all the rows expand.
New UI is nice though
Edit: Easy fix could be to set default state of rows to ‘collapsed’ as the transaction details are only interesting in specific cases.