Using Classic Outlook on Windows for personal email, calendar, and contact management
You're saying you can fix the problem by hitting enter ... ? I tried hitting enter after the silly centered/truncated line appears but nothing happens, but perhaps you mean something else ... ?
The alternative I've fallen back to is Bottom Border, which I can work with, but it seems to be one problem after another with Office updates and it's just utterly infuriating, frustrating, and time-wasting.