Those of use who are not UK residents do not see ISA - so we have two options and no scroll - I wouldn’t want the buttons to get smaller. May be Scott’s suggestion should apply only for UK residents?
Agree - I don’t use the CFD account yet it’s tucked in the middle. I would say on a scroll bar you should have the active accounts at the front / far left first. Not so bothered about scrolling/size, I guess though it may help some users in a readability sense.