In the COM Add-Ins window, uncheck any add-ins you think might be causing the problem and click OK.At the bottom of the window, ensure the Manage drop-down is set to COM Add-Ins and click Go.In the Options window, select Add-Ins from the left sidebar.To disable add-ins in Outlook, follow these steps. If it has, that indicates the issue is likely caused by an add-in. Once Outlook is running in safe mode, you can check if your inbox view has returned to normal.
In most cases, you can easily restore Outlook to its original state using the Reset View button.