Thanks for that hint. I just tested it roughly and can add, that if you add a login item, the “hamburger button” next to the custom field doesn’t seem to have a function (nothing happens when I click on it) and there comes a text (German translation in my case) that doesn’t seem to fit in for that button either… (both things marked in red in the following screenshot):
But apart from that - maybe that should also be posted in the “omnibus thread for feedback…” for the new extension ?! : Usability issues (UX) in redesigned UI (2024.12.0) (or be moved there by @grb ?)
PS: Ah, I was too quick - the hamburger menu is just for moving the custom fields around… A bit un-intuitive, when you just have one custom field… But the text makes more sense now… (though I never knew, you could move the custom fields around with the arrow keys 
)