The email account currently in use is displayed in the top left.
Clicking on the profile picture takes you to the account switcher.
You have to go to the hamburger menu to see the email account currently in use.
Being able to see the current account directly would improve the overview for DC users with many e-mail accounts and they could switch between accounts faster.
It would also make DC-Desktop more similar to the mobile versions.
The hamburger menu could be moved a little to the right to create space for the profile picture of the e-mail account.