I’m using Outlook 15.37 (170815) under macOS Sierra 10.12.6 on a MacBook Pro Retina, 15", Mid 2015. 7 accounts have been set up: 2 Exchange (one of them is my Office 365-account) and 5 POP-accounts from my ISP. One of these POP-accounts is specified as "Standard":
Until the last update [15.37 (170815)] only "On my Computer" in the sidebar expanded every time Outlook was opened. Since the last update my Office 365-account ("Onmicrosoft") expands too and I have to close it manually. See below.
How can I revert to the previous behavior?