Outlook app shows no message content other than the subject & recipient. How do I fix this?

[Windows Central Question]

A little while after Windows 10 was installed on my Asus Notebook, the Outlook app stopped displaying only the message information for every email account. I do not have an outlook account, but my other accounts are linked to the app. They are no showing message content. However, I can view the subject and recipient information for the message. How do I fix this so I can see my messages through Outlook?