I would love a way to be able to only manage and see one account at a time.
Once you add quite a few accounts to eMClient, it can become quite overwhelming visually, and can become quite slow to use as you collapse and expand various accounts.
I would love it if there was a simple account button in the top-left, where you could click it and it gives you a dropdown menu of all your accounts and you select one to focus on at a time.
I think this should be optional, as definitely some people would prefer to see all their accounts at once. But it would certainly be useful to be able to see only one account at a time.