Gmail inbox emails missing after unchecking "Important"

After installing I selected all of the emails in my gmail inbox and then unchecked “important” as I did not like looking at all of the yellow boxes on each email.  Next, all of the emails disappeared.  I checked the accounts using other email clients - same issue.  I checked my accounts using the web interface - same issue.  I found this article in the support:—all-of-my-messages-…

Followed the directions.  No luck.  How can I retrieve all of theses missing emails so they reappear in my inbox?  I am currently trying to find them in my gmail subfolders, but there are many.

Compatibility with Gmail is a big issue with this app and how it deals with the “important” label.  Not sure I can use this product in its current state.