After restoring my computer to an earlier backup, initially Thunderbird did not open. After reinstalling Thunderbird, it now opens but I have have lost the message preview function on the "home" page despite changing every view/layout/folders option available. The only way I can view emails in my inbox or sent box, is to right click on my email account name and open in new tab. How can I fix this so that view my inbox contents and sent email contents on the home screen?

Thanks