Using classic Outlook for Windows in business environments
Hi, I'm Diane and I'm happy to help you today.
When you restart Outlook, is it opening to the calendar folder?
Which version and build of Outlook are you using? See File, Office Account for the information if using classic Outlook.
Outlook cannot save settings like that in custom views. I know it will reopen in the week view, but don't recall it ever working with a custom number of days but will test it with the day view. (In a quickie test, it is working when I switch folders - I used alt+9 to select 9 days and it retained the selection when I switched to mail and back to calendar.)
Let me know how it goes, I'm here to help you further if needed.
-- Diane