Hi, I'm running Thunderbird on Linux Mint on a Thinkpad T470, I have two mail accounts, which are handled just fine.

I read somewhere about the unified inbox feature, so I clicked View>folders and ticked "unified folders". That gives me an inbox in the left pane, but when I click on it nothing is displayed on right side. I found out that you need to right-click that inbox, then go to properties and select the folders you want to be displayed. I did all that, still, when I click the unified inbox nothing happens at all, nothing is displayed, even though both mail accounts have mail in their respective inbox!