O365 inbox folder

Dear expert,

We are using o365  ProPlus on Mac and Win platform.
One of our user is using MacBook pro and suddenly his inbox became transparent like the attachment below. Only inbox folder is like this.
I have reinstalled the latest version then remove the cache of the outlook after that restart the laptop but nothing is changed.

Please help me
sam kamITAsked:
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It looks like the user isn't connected to the mail server.  There's a little zigzag by the account name.
sam kamITAuthor Commented:
I found the solution by a previous post.


I am wondering why nobody tried to help me to resolve the issue.
I responded, but you never got back about it.  It may also not be a frequent enough occurrence for others to have experience with.
sam kamITAuthor Commented:
Thank you for your reply.
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