Possibility to divide different mail accounts in favourites?

Hi everyone,

we have several email accounts. I arranged those folders of each account frequently used in the favourites to be able to work more efficiently. So there´s 9 accounts (business and private) with several folders all in one row in my favourites… it´s a little messy and I´d like to have it cleaner so I wondered if there´s a possibility to, for example, divide (and maybe to subdivide would be nice to have for others, too?) the accounts with a line?

Kind regards,