Using classic Outlook for Windows in business environments
Based on my research, below are some approaches you can try to reset the Outlook view back to its default state.
1/ Reset all views using the outlook.exe /cleanviews command
This option restores default views, and please note that any custom views you previously created will be removed.
First, close classic Outlook completely > press Windows + R > copy and paste the outlook.exe /cleanviews > OK.
2/ Reset the view using the ribbon
You can go to the View section in Outlook > select the folder that is currently experiencing the view issue > choose Reset View.
3/ Reset the current view through View Settings
Go to the View section > select View Settings > choose Reset Current View.
I hope this helps you move forward.
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