Have a new computer and set up Thunderbird 78 on it. Old computer had v78 and at top of folder pane had a row with "Name", "Unread", "Totals" displayed (option to show "Size" turned off). This allowed number of messages in each folder to be shown against the folder name. On new computer have enabled the Folder Pane but cannot get the row that allows display of (folder) name, unread, totals and size. Tried searching through options and also seeing what left clicks or right clicks might offer but no luck. (Note have another computer running v78 which has folder pane top row working; perhaps upgrading from earlier versions preserved this feature.) I have not yet looked in the prefs.js file but hope someone can give me a helpful answer before I do that.