It would be great to have a new option setting that Thunderbird for Android (K-9) start every time with an email account overview and the count of unread emails.
By clicking one of the accounts it should close the overview and open the email account that was clicked.
By swiping back the account overview should come back. So another email account could be clicked.
Why this would be great:
If you have a lot of email accounts actually you first start with one email account open, then you have to open the sidebar by clicking hamburger menu button, than to click another account and after that you have to close account overview sidebar and now you be able to repeat with next account... this is very time consuming.
Long time ago K-9 had this and for a lot of people this was a very unique and helpful feature to choose K-9 out of other Android email apps. To bring bring this back as an optional behaviour of thunderbird would make a lot of people happy for sure.