Smart View is enabled by default after installation. You can disable Smart View for all Microsoft Office applications on your computer or for Outlook alone.
To disable Smart View for all Microsoft Office applications (including Outlook):
From the Smart View ribbon, select Help.
Select About.
Clear Enable Add-in to disable Smart View the next time you open an Office application.
To disable Smart View for Outlook only:
From the Smart View ribbon in Excel, select Options, then Advanced in the left panel.
Under Others, select Disable Smart View add-in in Outlook.