Folder Disappears in Outlook 2019

[Loupjr]

I apologize in advance if this issue has already been addressed in this forum. My issue is that I have a folder that I created that keeps disappearing from the folder list. I can create a new folder using the same name, and the email that I had moved into the original folder will show up in the new folder, but as soon as I hit the Send/Receive button, the folder disappears from the list again. I have spent a fair amount of time looking for solutions, and I have found articles referring to Views or Filters, but nothing has worked so far. Any assistance is greatly appreciated.