After configured an account using IMAP in Thunderbird, user will find out there is actually only one Inbox and one Deleted folder by default.
In order to view other folders, below is the guide:
1. Click on "Manage folder subscription" which is under Advanced Features. You will see a popup box like below:
2. 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: