After configured an account using IMAP in Thunderbird, user will find out there is actually only one Inbox and one Deleted folder by default.
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In order to view other folders, below is the guide:
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- Click on "Manage folder subscription" which is under Advanced Features. You will see a popup box like below:

- Tick to choose the folders you want to view and click 'OK'.
For example, 'Junk E-Mail' was chosen, the output will be as below, 'Junk E-Mail' folder appears under Inbox: